Merged in feat/LOY-156-localize-user-languages (pull request #1452)

feat(LOY-156): Improve language handling and localization in profile page

* feat(LOY-156): Improve language handling and localization in profile page

* refactor(LOY-156): Improve language display using Intl.DisplayNames

* feat(LOY-156): Enhance country display with localized country names

* refactor(LOY-156): Move countries data to a dedicated constants file & more type safe country mapping

* feat(LOY-156): Update isValidLang to use languageSchema + German translation for membership terms and conditions

* chore(LOY-156): language handling in profile component


Approved-by: Christian Andolf

apps/scandic-web/i18n/dictionaries/de.json

@@ -391,7 +391,7 @@
   "Membership benefits applied": "Membership benefits applied",
   "Membership cards": "Mitgliedskarten",
   "Membership no": "Membership no",
-  "Membership terms and conditions": "Membership terms and conditions",
+  "Membership terms and conditions": "Allgemeine Mitgliedsbedingungen",
   "Menu": "Menü",
   "Menus": "Menüs",
   "Modify": "Ändern",