diff --git a/.gitignore b/.gitignore
index 803f8eb7..dec9281f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,6 +23,8 @@ priv/static/*
 !priv/static/.gitkeep
 priv/data/*
 !priv/data/.gitkeep
+priv/errors/*
+!priv/errors/.gitkeep
 .vscode/
 cover/
 site/
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 24aa810c..f108cdc5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,10 +8,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Special operations
 
-We added `application/ld+json` as acceptable MIME type for ActivityPub requests, so you'll need to recompile the `mime` library we use before recompiling Mobilizon:
-```
-MIX_ENV=prod mix deps.clean mime --build
-```
+* We added `application/ld+json` as acceptable MIME type for ActivityPub requests, so you'll need to recompile the `mime` library we use before recompiling Mobilizon:
+    ```
+    MIX_ENV=prod mix deps.clean mime --build
+    ```
+
+* The [nginx configuration](https://framagit.org/framasoft/mobilizon/-/blob/master/support/nginx/mobilizon.conf) has been changed with improvements and support for custom error pages.
 
 ### Added
 
diff --git a/config/config.exs b/config/config.exs
index d833be2f..5272fe76 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -19,6 +19,7 @@ config :mobilizon, :instance,
   registrations_open: false,
   registration_email_allowlist: [],
   languages: [],
+  default_language: "en",
   demo: false,
   repository: Mix.Project.config()[:source_url],
   allow_relay: true,
diff --git a/lib/mobilizon.ex b/lib/mobilizon.ex
index 8ed9f71b..496deb89 100644
--- a/lib/mobilizon.ex
+++ b/lib/mobilizon.ex
@@ -16,6 +16,7 @@ defmodule Mobilizon do
 
   alias Mobilizon.{Config, Storage, Web}
   alias Mobilizon.Federation.ActivityPub
+  alias Mobilizon.Service.ErrorPage
   alias Mobilizon.Service.Export.{Feed, ICalendar}
 
   @name Mix.Project.config()[:name]
@@ -104,7 +105,7 @@ defmodule Mobilizon do
   defp fallback_options(fallback), do: [fallback: fallback(default: fallback)]
 
   defp task_children(:test), do: []
-  defp task_children(_), do: [relay_actor(), anonymous_actor()]
+  defp task_children(_), do: [relay_actor(), anonymous_actor(), render_error_page()]
 
   defp relay_actor do
     %{
@@ -121,4 +122,12 @@ defmodule Mobilizon do
       restart: :temporary
     }
   end
+
+  defp render_error_page do
+    %{
+      id: :render_error_page_init,
+      start: {Task, :start_link, [&ErrorPage.init/0]},
+      restart: :temporary
+    }
+  end
 end
diff --git a/lib/service/error_page.ex b/lib/service/error_page.ex
new file mode 100644
index 00000000..bca368c9
--- /dev/null
+++ b/lib/service/error_page.ex
@@ -0,0 +1,17 @@
+defmodule Mobilizon.Service.ErrorPage do
+  @moduledoc """
+  Render an error page
+  """
+
+  def init do
+    render_error_page()
+  end
+
+  defp render_error_page do
+    content =
+      Phoenix.View.render_to_string(Mobilizon.Web.ErrorView, "500.html", conn: %Plug.Conn{})
+
+    path = Path.join(Application.app_dir(:mobilizon, "priv/errors"), "error.html")
+    File.write(path, content)
+  end
+end
diff --git a/lib/web/gettext.ex b/lib/web/gettext.ex
index 18a2fd49..7718ce6e 100644
--- a/lib/web/gettext.ex
+++ b/lib/web/gettext.ex
@@ -37,8 +37,8 @@ defmodule Mobilizon.Web.Gettext do
       locale in locales -> locale
       # Either the first part matches, "fr_CA" => "fr"
       split_locale(locale) in locales -> split_locale(locale)
-      # Otherwise default to english
-      true -> "en"
+      # Otherwise set to default
+      true -> Keyword.get(Mobilizon.Config.instance_config(), :default_language, "en") || "en"
     end
   end
 
diff --git a/lib/web/templates/error/500_page.html.eex b/lib/web/templates/error/500_page.html.eex
new file mode 100644
index 00000000..4c58c312
--- /dev/null
+++ b/lib/web/templates/error/500_page.html.eex
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<html lang="<%= Gettext.get_locale() %>">
+  <head>
+    <meta charset="utf-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <title><%= gettext "This page is not correct" %></title>
+    <style>
+      body.error {
+        font-family: BlinkMacSystemFont, Roboto, Oxygen, Ubuntu, Cantarell, Segoe UI, Fira Sans, Droid Sans, Helvetica Neue, Helvetica, Arial, sans-serif;
+        background: #efeef4;
+        position: absolute;
+        text-align: center;
+        color: #3c376e;
+        width: 100%;
+        height: 100%;
+        padding: 0;
+        display: flex;
+        justify-content: center;
+        align-items: center;
+      }
+      
+      body.error .dialog h1 {
+        font-size: 20px;
+        line-height: 28px;
+        font-weight: 400;
+      }
+      
+      body.error .dialog img {
+        display: block;
+        max-width: 470px;
+        width: 100%;
+        height: auto;
+        margin: -120px auto auto;
+      }
+    </style>
+  </head>
+  <body class="error">
+    <main role="main" class="dialog">
+      <div class="error_illustration">
+        <img src="/static/img/mobilizon_logo.png" />
+        <!-- <img src="/static/img/error.png" alt="" width="500" /> -->
+      </div>
+      <div class="error__message">
+        <h1><%= gettext "We're sorry, but something went wrong on our end." %></h1>
+        <p><%= gettext "The Mobilizon server seems to be temporarily down." %></p>
+      </div>
+    </main>
+  </body>
+</html>
diff --git a/lib/web/views/error_view.ex b/lib/web/views/error_view.ex
index 398c8b95..5c27caf5 100644
--- a/lib/web/views/error_view.ex
+++ b/lib/web/views/error_view.ex
@@ -39,7 +39,11 @@ defmodule Mobilizon.Web.ErrorView do
   end
 
   def render("500.html", _assigns) do
-    "Internal server error"
+    Mobilizon.Config.instance_config()
+    |> Keyword.get(:default_language, "en")
+    |> Gettext.put_locale()
+
+    render("500_page.html", %{})
   end
 
   # In case no render clause matches or no
diff --git a/priv/errors/.gitkeep b/priv/errors/.gitkeep
new file mode 100644
index 00000000..e69de29b
diff --git a/priv/gettext/ar/LC_MESSAGES/default.po b/priv/gettext/ar/LC_MESSAGES/default.po
index 94c25fcd..8438fec3 100644
--- a/priv/gettext/ar/LC_MESSAGES/default.po
+++ b/priv/gettext/ar/LC_MESSAGES/default.po
@@ -1395,12 +1395,27 @@ msgstr ""
 msgid "You issued a request to attend <b>%{title}</b>."
 msgstr ""
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:64
 msgid "Event title"
 msgstr "الفعالية"
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:38
 msgid "There have been changes for <b>%{title}</b> so we'd thought we'd let you know."
 msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:46
+msgid "The Mobilizon server seems to be temporarily down."
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:7
+msgid "This page is not correct"
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:45
+msgid "We're sorry, but something went wrong on our end."
+msgstr ""
diff --git a/priv/gettext/be/LC_MESSAGES/default.po b/priv/gettext/be/LC_MESSAGES/default.po
index 68c0a2c3..b883b99e 100644
--- a/priv/gettext/be/LC_MESSAGES/default.po
+++ b/priv/gettext/be/LC_MESSAGES/default.po
@@ -1371,12 +1371,27 @@ msgstr ""
 msgid "You issued a request to attend <b>%{title}</b>."
 msgstr ""
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:64
 msgid "Event title"
 msgstr ""
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:38
 msgid "There have been changes for <b>%{title}</b> so we'd thought we'd let you know."
 msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:46
+msgid "The Mobilizon server seems to be temporarily down."
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:7
+msgid "This page is not correct"
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:45
+msgid "We're sorry, but something went wrong on our end."
+msgstr ""
diff --git a/priv/gettext/ca/LC_MESSAGES/default.po b/priv/gettext/ca/LC_MESSAGES/default.po
index 372a1a5b..26bf766b 100644
--- a/priv/gettext/ca/LC_MESSAGES/default.po
+++ b/priv/gettext/ca/LC_MESSAGES/default.po
@@ -1391,12 +1391,27 @@ msgstr ""
 msgid "You issued a request to attend <b>%{title}</b>."
 msgstr ""
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:64
 msgid "Event title"
 msgstr "Activitat"
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:38
 msgid "There have been changes for <b>%{title}</b> so we'd thought we'd let you know."
 msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:46
+msgid "The Mobilizon server seems to be temporarily down."
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:7
+msgid "This page is not correct"
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:45
+msgid "We're sorry, but something went wrong on our end."
+msgstr ""
diff --git a/priv/gettext/cs/LC_MESSAGES/default.po b/priv/gettext/cs/LC_MESSAGES/default.po
index da2b289c..26a8692b 100644
--- a/priv/gettext/cs/LC_MESSAGES/default.po
+++ b/priv/gettext/cs/LC_MESSAGES/default.po
@@ -1371,12 +1371,27 @@ msgstr ""
 msgid "You issued a request to attend <b>%{title}</b>."
 msgstr ""
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:64
 msgid "Event title"
 msgstr ""
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:38
 msgid "There have been changes for <b>%{title}</b> so we'd thought we'd let you know."
 msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:46
+msgid "The Mobilizon server seems to be temporarily down."
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:7
+msgid "This page is not correct"
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:45
+msgid "We're sorry, but something went wrong on our end."
+msgstr ""
diff --git a/priv/gettext/de/LC_MESSAGES/default.po b/priv/gettext/de/LC_MESSAGES/default.po
index 59016be5..caec2526 100644
--- a/priv/gettext/de/LC_MESSAGES/default.po
+++ b/priv/gettext/de/LC_MESSAGES/default.po
@@ -1399,12 +1399,27 @@ msgstr ""
 msgid "You issued a request to attend <b>%{title}</b>."
 msgstr ""
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:64
 msgid "Event title"
 msgstr "Veranstaltung"
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:38
 msgid "There have been changes for <b>%{title}</b> so we'd thought we'd let you know."
 msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:46
+msgid "The Mobilizon server seems to be temporarily down."
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:7
+msgid "This page is not correct"
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:45
+msgid "We're sorry, but something went wrong on our end."
+msgstr ""
diff --git a/priv/gettext/default.pot b/priv/gettext/default.pot
index 3581d4c2..4ae1d133 100644
--- a/priv/gettext/default.pot
+++ b/priv/gettext/default.pot
@@ -1359,3 +1359,18 @@ msgstr ""
 #: lib/web/templates/email/event_updated.html.eex:38
 msgid "There have been changes for <b>%{title}</b> so we'd thought we'd let you know."
 msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:46
+msgid "The Mobilizon server seems to be temporarily down."
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:7
+msgid "This page is not correct"
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:45
+msgid "We're sorry, but something went wrong on our end."
+msgstr ""
diff --git a/priv/gettext/en/LC_MESSAGES/default.po b/priv/gettext/en/LC_MESSAGES/default.po
index 92c08e70..5d651236 100644
--- a/priv/gettext/en/LC_MESSAGES/default.po
+++ b/priv/gettext/en/LC_MESSAGES/default.po
@@ -1403,12 +1403,27 @@ msgstr ""
 msgid "You issued a request to attend <b>%{title}</b>."
 msgstr ""
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:64
 msgid "Event title"
 msgstr "Event"
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:38
 msgid "There have been changes for <b>%{title}</b> so we'd thought we'd let you know."
 msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:46
+msgid "The Mobilizon server seems to be temporarily down."
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:7
+msgid "This page is not correct"
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:45
+msgid "We're sorry, but something went wrong on our end."
+msgstr ""
diff --git a/priv/gettext/es/LC_MESSAGES/default.po b/priv/gettext/es/LC_MESSAGES/default.po
index 62a94b33..fbcd9a89 100644
--- a/priv/gettext/es/LC_MESSAGES/default.po
+++ b/priv/gettext/es/LC_MESSAGES/default.po
@@ -1699,12 +1699,27 @@ msgstr ""
 msgid "You issued a request to attend <b>%{title}</b>."
 msgstr "Envió una solicitud para asistir a %{title}."
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:64
 msgid "Event title"
 msgstr "Evento"
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:38
 msgid "There have been changes for <b>%{title}</b> so we'd thought we'd let you know."
 msgstr "Ha habido cambios para% {title}, así que pensamos en avisarle."
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:46
+msgid "The Mobilizon server seems to be temporarily down."
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:7
+msgid "This page is not correct"
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:45
+msgid "We're sorry, but something went wrong on our end."
+msgstr ""
diff --git a/priv/gettext/fi/LC_MESSAGES/default.po b/priv/gettext/fi/LC_MESSAGES/default.po
index 7158cf11..eb913c33 100644
--- a/priv/gettext/fi/LC_MESSAGES/default.po
+++ b/priv/gettext/fi/LC_MESSAGES/default.po
@@ -1649,12 +1649,27 @@ msgstr ""
 msgid "You issued a request to attend <b>%{title}</b>."
 msgstr "Lähetit pyynnön osallistua tapahtumaan %{title}."
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:64
 msgid "Event title"
 msgstr "Tapahtuma"
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:38
 msgid "There have been changes for <b>%{title}</b> so we'd thought we'd let you know."
 msgstr "%{title} on joiltain osin muuttunut, ja ajattelimme ilmoittaa asiasta."
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:46
+msgid "The Mobilizon server seems to be temporarily down."
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:7
+msgid "This page is not correct"
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:45
+msgid "We're sorry, but something went wrong on our end."
+msgstr ""
diff --git a/priv/gettext/fr/LC_MESSAGES/default.po b/priv/gettext/fr/LC_MESSAGES/default.po
index 01df84ec..b6267bcb 100644
--- a/priv/gettext/fr/LC_MESSAGES/default.po
+++ b/priv/gettext/fr/LC_MESSAGES/default.po
@@ -10,7 +10,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "POT-Creation-Date: \n"
-"PO-Revision-Date: 2020-10-08 08:52+0200\n"
+"PO-Revision-Date: 2020-10-09 09:46+0200\n"
 "Last-Translator: Thomas Citharel <thomas.citharel@framasoft.org>\n"
 "Language-Team: French <https://weblate.framasoft.org/projects/mobilizon/backend/fr/>\n"
 "Language: fr\n"
@@ -1094,3 +1094,15 @@ msgstr "Titre de l'événement"
 #: lib/web/templates/email/event_updated.html.eex:38
 msgid "There have been changes for <b>%{title}</b> so we'd thought we'd let you know."
 msgstr "Il y a eu des changements pour <b>%{title}</b> donc nous avons pensé que nous vous le ferions savoir."
+
+#: lib/web/templates/error/500_page.html.eex:46
+msgid "The Mobilizon server seems to be temporarily down."
+msgstr "Le serveur Mobilizon semble être temporairement hors-service."
+
+#: lib/web/templates/error/500_page.html.eex:7
+msgid "This page is not correct"
+msgstr "Cette page n’est pas correcte"
+
+#: lib/web/templates/error/500_page.html.eex:45
+msgid "We're sorry, but something went wrong on our end."
+msgstr "Nous sommes désolé·e·s, mais quelque chose s’est mal passé de notre côté."
diff --git a/priv/gettext/it/LC_MESSAGES/default.po b/priv/gettext/it/LC_MESSAGES/default.po
index 80fff496..3f613515 100644
--- a/priv/gettext/it/LC_MESSAGES/default.po
+++ b/priv/gettext/it/LC_MESSAGES/default.po
@@ -1369,12 +1369,27 @@ msgstr ""
 msgid "You issued a request to attend <b>%{title}</b>."
 msgstr ""
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:64
 msgid "Event title"
 msgstr "Evento"
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:38
 msgid "There have been changes for <b>%{title}</b> so we'd thought we'd let you know."
 msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:46
+msgid "The Mobilizon server seems to be temporarily down."
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:7
+msgid "This page is not correct"
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:45
+msgid "We're sorry, but something went wrong on our end."
+msgstr ""
diff --git a/priv/gettext/ja/LC_MESSAGES/default.po b/priv/gettext/ja/LC_MESSAGES/default.po
index e3c657ca..f2fef6d7 100644
--- a/priv/gettext/ja/LC_MESSAGES/default.po
+++ b/priv/gettext/ja/LC_MESSAGES/default.po
@@ -1359,12 +1359,27 @@ msgstr ""
 msgid "You issued a request to attend <b>%{title}</b>."
 msgstr ""
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:64
 msgid "Event title"
 msgstr "イベント"
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:38
 msgid "There have been changes for <b>%{title}</b> so we'd thought we'd let you know."
 msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:46
+msgid "The Mobilizon server seems to be temporarily down."
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:7
+msgid "This page is not correct"
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:45
+msgid "We're sorry, but something went wrong on our end."
+msgstr ""
diff --git a/priv/gettext/nl/LC_MESSAGES/default.po b/priv/gettext/nl/LC_MESSAGES/default.po
index 598496e4..7994fcb5 100644
--- a/priv/gettext/nl/LC_MESSAGES/default.po
+++ b/priv/gettext/nl/LC_MESSAGES/default.po
@@ -1394,12 +1394,27 @@ msgstr ""
 msgid "You issued a request to attend <b>%{title}</b>."
 msgstr ""
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:64
 msgid "Event title"
 msgstr "Evenement"
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:38
 msgid "There have been changes for <b>%{title}</b> so we'd thought we'd let you know."
 msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:46
+msgid "The Mobilizon server seems to be temporarily down."
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:7
+msgid "This page is not correct"
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:45
+msgid "We're sorry, but something went wrong on our end."
+msgstr ""
diff --git a/priv/gettext/oc/LC_MESSAGES/default.po b/priv/gettext/oc/LC_MESSAGES/default.po
index 47985aba..0222116b 100644
--- a/priv/gettext/oc/LC_MESSAGES/default.po
+++ b/priv/gettext/oc/LC_MESSAGES/default.po
@@ -1396,12 +1396,27 @@ msgstr ""
 msgid "You issued a request to attend <b>%{title}</b>."
 msgstr ""
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:64
 msgid "Event title"
 msgstr "Eveniment"
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:38
 msgid "There have been changes for <b>%{title}</b> so we'd thought we'd let you know."
 msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:46
+msgid "The Mobilizon server seems to be temporarily down."
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:7
+msgid "This page is not correct"
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:45
+msgid "We're sorry, but something went wrong on our end."
+msgstr ""
diff --git a/priv/gettext/pl/LC_MESSAGES/default.po b/priv/gettext/pl/LC_MESSAGES/default.po
index 8f5e9931..1ecc0b0c 100644
--- a/priv/gettext/pl/LC_MESSAGES/default.po
+++ b/priv/gettext/pl/LC_MESSAGES/default.po
@@ -1407,12 +1407,27 @@ msgstr ""
 msgid "You issued a request to attend <b>%{title}</b>."
 msgstr ""
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:64
 msgid "Event title"
 msgstr "Wydarzenie"
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:38
 msgid "There have been changes for <b>%{title}</b> so we'd thought we'd let you know."
 msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:46
+msgid "The Mobilizon server seems to be temporarily down."
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:7
+msgid "This page is not correct"
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:45
+msgid "We're sorry, but something went wrong on our end."
+msgstr ""
diff --git a/priv/gettext/pt/LC_MESSAGES/default.po b/priv/gettext/pt/LC_MESSAGES/default.po
index 142941d9..27a515b8 100644
--- a/priv/gettext/pt/LC_MESSAGES/default.po
+++ b/priv/gettext/pt/LC_MESSAGES/default.po
@@ -1364,12 +1364,27 @@ msgstr ""
 msgid "You issued a request to attend <b>%{title}</b>."
 msgstr ""
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:64
 msgid "Event title"
 msgstr ""
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:38
 msgid "There have been changes for <b>%{title}</b> so we'd thought we'd let you know."
 msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:46
+msgid "The Mobilizon server seems to be temporarily down."
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:7
+msgid "This page is not correct"
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:45
+msgid "We're sorry, but something went wrong on our end."
+msgstr ""
diff --git a/priv/gettext/pt_BR/LC_MESSAGES/default.po b/priv/gettext/pt_BR/LC_MESSAGES/default.po
index 23f03de4..ad4adc1f 100644
--- a/priv/gettext/pt_BR/LC_MESSAGES/default.po
+++ b/priv/gettext/pt_BR/LC_MESSAGES/default.po
@@ -1486,12 +1486,27 @@ msgstr ""
 msgid "You issued a request to attend <b>%{title}</b>."
 msgstr ""
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:64
 msgid "Event title"
 msgstr "Evento"
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:38
 msgid "There have been changes for <b>%{title}</b> so we'd thought we'd let you know."
 msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:46
+msgid "The Mobilizon server seems to be temporarily down."
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:7
+msgid "This page is not correct"
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:45
+msgid "We're sorry, but something went wrong on our end."
+msgstr ""
diff --git a/priv/gettext/ru/LC_MESSAGES/default.po b/priv/gettext/ru/LC_MESSAGES/default.po
index 8d212a7b..ddba4a89 100644
--- a/priv/gettext/ru/LC_MESSAGES/default.po
+++ b/priv/gettext/ru/LC_MESSAGES/default.po
@@ -1382,12 +1382,27 @@ msgstr ""
 msgid "You issued a request to attend <b>%{title}</b>."
 msgstr ""
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:64
 msgid "Event title"
 msgstr "Событие"
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:38
 msgid "There have been changes for <b>%{title}</b> so we'd thought we'd let you know."
 msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:46
+msgid "The Mobilizon server seems to be temporarily down."
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:7
+msgid "This page is not correct"
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:45
+msgid "We're sorry, but something went wrong on our end."
+msgstr ""
diff --git a/priv/gettext/sv/LC_MESSAGES/default.po b/priv/gettext/sv/LC_MESSAGES/default.po
index dd808ad9..ccb1efab 100644
--- a/priv/gettext/sv/LC_MESSAGES/default.po
+++ b/priv/gettext/sv/LC_MESSAGES/default.po
@@ -1387,12 +1387,27 @@ msgstr ""
 msgid "You issued a request to attend <b>%{title}</b>."
 msgstr ""
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:64
 msgid "Event title"
 msgstr "Evenemang"
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/web/templates/email/event_updated.html.eex:38
 msgid "There have been changes for <b>%{title}</b> so we'd thought we'd let you know."
 msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:46
+msgid "The Mobilizon server seems to be temporarily down."
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:7
+msgid "This page is not correct"
+msgstr ""
+
+#, elixir-format
+#: lib/web/templates/error/500_page.html.eex:45
+msgid "We're sorry, but something went wrong on our end."
+msgstr ""
diff --git a/support/nginx/mobilizon.conf b/support/nginx/mobilizon.conf
index 7ff6a169..aff05d8e 100644
--- a/support/nginx/mobilizon.conf
+++ b/support/nginx/mobilizon.conf
@@ -35,13 +35,14 @@ server {
     # ssl_certificate_key       /etc/letsencrypt/live/example.tld/privkey.pem;
 
     # Add TLSv1.3 if it's supported by your system
-    ssl_protocols TLSv1.2;
+    ssl_protocols TLSv1.2 TLSv1.3;
     ssl_ciphers 'EECDH+aRSA+AESGCM:EECDH+aRSA+SHA384:EECDH+aRSA+SHA256:EECDH:+CAMELLIA256:+AES256:+CAMELLIA128:+AES128:+SSLv3:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!DSS:!RC4:!SEED:!ECDSA';
     ssl_prefer_server_ciphers on;
     ssl_ecdh_curve prime256v1;
     # ssl_ecdh_curve X25519:prime256v1:secp384r1:secp521r1;
     ssl_stapling on;
     ssl_stapling_verify on;
+    add_header Strict-Transport-Security "max-age=31536000";
 
     gzip on;
     gzip_disable "msie6";
@@ -55,6 +56,18 @@ server {
     # the nginx default is 1m, not enough for large media uploads
     client_max_body_size 16m;
 
+    proxy_http_version 1.1;
+    proxy_set_header Upgrade $http_upgrade;
+    proxy_set_header Connection "upgrade";
+    proxy_set_header Host $http_host;
+    proxy_set_header X-Real-IP $remote_addr;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    
+
+    location / {
+        try_files $uri @proxy;
+    }
+
     # Let's Encrypt keeps its files here
     location ^~ '/.well-known/acme-challenge' {
         root /var/www/certbot;
@@ -62,29 +75,27 @@ server {
     }
 
     location / {
-        gzip off;
-        proxy_http_version 1.1;
-        proxy_set_header X-Real-IP $remote_addr;
-        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
-
-        # For Websocket support
-        proxy_set_header Upgrade $http_upgrade;
-        proxy_set_header Connection "upgrade";
-        proxy_set_header Host $http_host;
-
-        proxy_redirect off;
-
         proxy_pass http://localhost:4000;
-
-        client_max_body_size 16m;
     }
 
-    location ~* \.(css|js)$ {
+    location ~ ^/(js|css) {
         root /home/mobilizon/live/priv/static;
         etag off;
-        expires 1y;
         access_log off;
-        add_header Cache-Control public;
+        add_header Cache-Control "public, max-age=31536000, immutable";
+    }
+
+    location ~ ^/(media|proxy) {
+        etag off;
+        access_log off;
+        add_header Cache-Control "public, max-age=31536000, immutable";
+        proxy_pass http://localhost:4000;
+    }
+
+    error_page 500 501 502 503 504 @error;
+    location @error {
+            root /home/tcit/dev/frama/mobilizon/priv/errors;
+            try_files /error.html 502;
     }
 
 }
diff --git a/test/service/error_page_test.exs b/test/service/error_page_test.exs
new file mode 100644
index 00000000..035353f2
--- /dev/null
+++ b/test/service/error_page_test.exs
@@ -0,0 +1,31 @@
+defmodule Mobilizon.Service.ErrorPageTest do
+  @moduledoc """
+  Test the error page producer module
+  """
+
+  alias Mobilizon.Config
+  alias Mobilizon.Service.ErrorPage
+
+  use Mobilizon.DataCase
+
+  describe "init/0" do
+    test "renders an error page in the default language" do
+      ErrorPage.init()
+      path = Path.join(Application.app_dir(:mobilizon, "priv/errors"), "error.html")
+      assert File.exists?(path)
+      assert {:ok, data} = File.read(path)
+      assert data =~ "This page is not correct"
+    end
+
+    test "uses the instance default language if defined" do
+      Config.put([:instance, :default_language], "fr")
+      ErrorPage.init()
+      path = Path.join(Application.app_dir(:mobilizon, "priv/errors"), "error.html")
+      assert File.exists?(path)
+      assert {:ok, data} = File.read(path)
+      refute data =~ "This page is not correct"
+      assert data =~ "<html lang=\"fr\">"
+      Config.put([:instance, :default_language], "en")
+    end
+  end
+end
diff --git a/test/web/views/error_view_test.exs b/test/web/views/error_view_test.exs
index 8cb250bb..419c94a2 100644
--- a/test/web/views/error_view_test.exs
+++ b/test/web/views/error_view_test.exs
@@ -17,10 +17,14 @@ defmodule Mobilizon.Web.ErrorViewTest do
   end
 
   test "render 500.html" do
-    assert render_to_string(ErrorView, "500.html", []) == "Internal server error"
+    assert render_to_string(ErrorView, "500.html", []) =~
+             Phoenix.HTML.html_escape("We're sorry, but something went wrong on our end.")
+             |> Phoenix.HTML.safe_to_string()
   end
 
   test "render any other" do
-    assert render_to_string(ErrorView, "505.html", []) == "Internal server error"
+    assert render_to_string(ErrorView, "505.html", []) =~
+             Phoenix.HTML.html_escape("We're sorry, but something went wrong on our end.")
+             |> Phoenix.HTML.safe_to_string()
   end
 end
