This changes the REST API to return unicode domains in the `acct`
attribute instead of punycode, and to render unicode instead of
punycode on public HTML pages as well.
Fix#7812, fix#12246
* Replace will_paginate with kaminari
* Use #page instead of #paginate in controllers
* Replace will_paginate.page_gap with pagination.truncate in i18n
* Customize kaminari views to match prior styles
* Set kaminari options to match prior behavior
* Replace will_paginate with paginate in views
