devex: migrate to vue-i18n (#4966)

* sample languages refactor

* feat: consistency + dedupe impl of i18n

* fix: broken imports

* fix: intl formatted component

* fix: use relative imports

* fix: imports

* fix: comment out incomplete locales + fix imports

* feat: cleanup

* fix: ui imports

* fix: lint

* fix: admonition import

* make footer a component, fix language reactivity

* make copyright notice untranslatable

---------

Co-authored-by: Calum H. <contact@cal.engineer>

apps/frontend/src/locales/en-US/index.json

@@ -1364,9 +1364,6 @@
   "layout.footer.about.status": {
     "message": "Status"
   },
-  "layout.footer.copyright": {
-    "message": "© {year} Rinth, Inc."
-  },
   "layout.footer.legal": {
     "message": "Legal"
   },
@@ -2813,18 +2810,9 @@
   "settings.display.theme.title": {
     "message": "Color theme"
   },
-  "settings.language.categories.auto": {
-    "message": "Automatic"
-  },
   "settings.language.categories.default": {
     "message": "Standard languages"
   },
-  "settings.language.categories.experimental": {
-    "message": "Experimental languages"
-  },
-  "settings.language.categories.fun": {
-    "message": "Fun languages"
-  },
   "settings.language.categories.search-result": {
     "message": "Search results"
   },
@@ -2834,18 +2822,6 @@
   "settings.language.languages.automatic": {
     "message": "Sync with the system language"
   },
-  "settings.language.languages.language-label-applying": {
-    "message": "{label}. Applying..."
-  },
-  "settings.language.languages.language-label-error": {
-    "message": "{label}. Error"
-  },
-  "settings.language.languages.load-failed": {
-    "message": "Cannot load this language. Try again in a bit."
-  },
-  "settings.language.languages.search-field.description": {
-    "message": "Submit to focus the first search result"
-  },
   "settings.language.languages.search-field.placeholder": {
     "message": "Search for a language..."
   },