Add Danish localization (#7220)

* Add Danish localization

* Fix

* Update src/locale/locales/da/messages.po

Co-authored-by: Frudrax Cheng <i@cynosura.one>

* Typo

* Inconsistent translation of "draft"

* Do not use "post" as verb

* Change "post"/"repost" to "opslag"/"videredeling"

* Fix "About"

* Fix

* Add to iOS config

* Sort alphabetically

* Typo fixes by @kseistrup

* Fix gender of "opslag"

* Plural

* "videredeling" > "deling"

* Be specific that ÆØÅ is not allowed

* Add new strings from main

---------

Co-authored-by: Frudrax Cheng <i@cynosura.one>

src/locale/helpers.ts

@@ -161,6 +161,8 @@ export function sanitizeAppLanguageSetting(appLanguage: string): AppLanguage {
         return AppLanguage.ast
       case 'ca':
         return AppLanguage.ca
+      case 'da':
+        return AppLanguage.da
       case 'de':
         return AppLanguage.de
       case 'el':