Translate backend-rendered pages

See merge request !3634

Update Caddyfile to Caddy v2

Closes #2764

See merge request pleroma/pleroma!3641

Delete report notifs when demoting from superuser

Closes #2840

See merge request pleroma/pleroma!3642

mix: Check `.git` presence

See merge request pleroma/pleroma!3638

Use patern matching to see if someone was superuser before

Fix test get_user_apps/1

See merge request pleroma/pleroma!3636

Copyright bump for 2022

See merge request pleroma/pleroma!3593

When someone isn't a superuser any more, they shouldn't see the reporsts any more either.
Here we delete the report notifications from a user when that user gets updated from being a superuser to a non-superuser.

elixir gettext current does not fully support fallback to another language [0].
But it might in the future. We adapt it so that all languages in Accept-Language
headers are received by Pleroma.Web.Gettext. User.languages is now a comma-separated
list.

[0]: https://github.com/elixir-gettext/gettext/issues/303

For an example, here, zh is not supported, but zh_Hans and zh_Hant
are. If the user asks for zh, we should choose a variant for them
instead of fallbacking to default.

Some browsers (e.g. Firefox) does not allow users to customize
their language codes. For example, there is no zh-Hans, but only
zh, zh-CN, zh-TW, zh-HK, etc. This provides a workaround for
those users suffering from bad design decisions.

Revert "Merge branch 'revert/notice-routes' into 'develop'"

See merge request !3639

This reverts merge request !3576

Revert notice compatibility routes merge request

See merge request pleroma/pleroma!3576

For some reason I had a test who suddenly failed, mix test test/pleroma/web/o_auth/app_test.exs:54. A user has a list of applications and this test adds them and then sees if the list it gets back is the same as the apps it added.

When I ran mix test a day before I didn't have this problem and when I pushed code today in a different MR, the pipeline succeeded (see https://git.pleroma.social/ilja/pleroma/-/jobs/205827), yet locally it failed. So it seems the test can sometimes succeed and sometimes fail, which makes it untrustworthy.

The failure I see is because the returned list is in reverse order. I assume that's not per sé wrong. You just want to know if the apps you added are actually there. I fixed the test by first ordering the lists before comparing.

AFAICT (and as far as that's relevant) the test got introduced in commit cb2a072e