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>

packages/ui/src/components/modal/TabbedModal.vue

@@ -1,7 +1,8 @@
 <script setup lang="ts">
-import { type MessageDescriptor, useVIntl } from '@vintl/vintl'
 import { type Component, ref } from 'vue'
 
+import { type MessageDescriptor, useVIntl } from '../../composables/i18n'
+
 const { formatMessage } = useVIntl()
 
 export type Tab<Props> = {