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/app-frontend/src/components/ui/UpdateToast.vue

@@ -1,8 +1,7 @@
 <script setup lang="ts">
 import { DownloadIcon, ExternalIcon, RefreshCwIcon, SpinnerIcon, XIcon } from '@modrinth/assets'
-import { ButtonStyled, commonMessages, ProgressBar } from '@modrinth/ui'
+import { ButtonStyled, commonMessages, defineMessages, ProgressBar, useVIntl } from '@modrinth/ui'
 import { formatBytes } from '@modrinth/utils'
-import { defineMessages, useVIntl } from '@vintl/vintl'
 import { ref } from 'vue'
 
 import { injectAppUpdateDownloadProgress } from '@/providers/download-progress.ts'