* origin/develop: (294 commits)
Fix incorrect fallback when English is set to first language
Fix eratic test for POST /api/pleroma/admin/reports/:id/notes
After code review
Support fallbacking to other languages
Delete report notifs when demoting from superuser
Update Caddyfile to Caddy v2
Lint
Support multiple locales from userLanguage cookie
Support multiple locales formally
Make lint happy
Add test for fallbacking to a general language
Fallback to a variant if the language in general is not supported
Add changelog
Document API addition
Allow user to register with custom language
Allow update_credentials to update User.language
Send emails i18n'd using backend-stored user language
Make all emails translatable
Fix digest test
Make mail and mailer translatable
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