diff --git a/app/javascript/mastodon/locales/locale-data/co.js b/app/javascript/mastodon/locales/locale-data/co.js
new file mode 100644
index 000000000..2b071ecbd
--- /dev/null
+++ b/app/javascript/mastodon/locales/locale-data/co.js
@@ -0,0 +1,108 @@
+/*eslint eqeqeq: "off"*/
+/*eslint no-nested-ternary: "off"*/
+/*eslint quotes: "off"*/
+
+export default [{
+  locale: "co",
+  pluralRuleFunction: function (e, a) {
+    return a ? 1 == e ? "one" : "other" : e >= 0 && e < 2 ? "one" : "other";
+  },
+  fields: {
+    year: {
+      displayName: "annu",
+      relative: {
+        0: "quist'annu",
+        1: "l'annu chì vene",
+        "-1": "l'annu passatu",
+      },
+      relativeTime: {
+        future: {
+          one: "in {0} annu",
+          other: "in {0} anni",
+        },
+        past: {
+          one: "{0} annu fà",
+          other: "{0} anni fà",
+        },
+      },
+    },
+    month: {
+      displayName: "mese",
+      relative: {
+        0: "Questu mese",
+        1: "u mese chì vene",
+        "-1": "u mese passatu",
+      },
+      relativeTime: {
+        future: {
+          one: "in {0} mese",
+          other: "in {0} mesi",
+        },
+        past: {
+          one: "{0} mese fà",
+          other: "{0} mesi fà",
+        },
+      },
+    },
+    day: {
+      displayName: "ghjornu",
+      relative: {
+        0: "oghje",
+        1: "dumane",
+        "-1": "eri",
+      },
+      relativeTime: {
+        future: {
+          one: "in {0} ghjornu",
+          other: "in {0} ghjornu",
+        },
+        past: {
+          one: "{0} ghjornu fà",
+          other: "{0} ghjorni fà",
+        },
+      },
+    },
+    hour: {
+      displayName: "ora",
+      relativeTime: {
+        future: {
+          one: "in {0} ora",
+          other: "in {0} ore",
+        },
+        past: {
+          one: "{0} ora fà",
+          other: "{0} ore fà",
+        },
+      },
+    },
+    minute: {
+      displayName: "minuta",
+      relativeTime: {
+        future: {
+          one: "in {0} minuta",
+          other: "in {0} minute",
+        },
+        past: {
+          one: "{0} minuta fà",
+          other: "{0} minute fà",
+        },
+      },
+    },
+    second: {
+      displayName: "siconda",
+      relative: {
+        0: "avà",
+      },
+      relativeTime: {
+        future: {
+          one: "in {0} siconda",
+          other: "in {0} siconde",
+        },
+        past: {
+          one: "{0} siconda fà",
+          other: "{0} siconde fà",
+        },
+      },
+    },
+  },
+}];