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/pages/plus.vue

@@ -86,7 +86,7 @@
 </template>
 <script setup>
 import { HeartIcon, ModrinthPlusIcon, SettingsIcon, SparklesIcon, StarIcon } from '@modrinth/assets'
-import { injectNotificationManager, PurchaseModal } from '@modrinth/ui'
+import { injectNotificationManager, PurchaseModal, useVIntl } from '@modrinth/ui'
 import { calculateSavings, formatPrice, getCurrency } from '@modrinth/utils'
 
 import { useBaseFetch } from '@/composables/fetch.js'