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/admin/billing/[id].vue

@@ -326,11 +326,13 @@ import {
 	Avatar,
 	ButtonStyled,
 	CopyCode,
+	defineMessages,
 	DropdownSelect,
 	injectNotificationManager,
 	NewModal,
 	Toggle,
 	useRelativeTime,
+	useVIntl,
 } from '@modrinth/ui'
 import { formatCategory, formatPrice } from '@modrinth/utils'
 import { DEFAULT_CREDIT_EMAIL_MESSAGE } from '@modrinth/utils/utils.ts'

apps/frontend/src/pages/admin/servers/notices.vue

@@ -267,16 +267,17 @@ import {
 	Combobox,
 	commonMessages,
 	CopyCode,
+	defineMessages,
 	injectNotificationManager,
 	NewModal,
 	ServerNotice,
 	TagItem,
 	Toggle,
 	useRelativeTime,
+	useVIntl,
 } from '@modrinth/ui'
 import { NOTICE_LEVELS } from '@modrinth/ui/src/utils/notices.ts'
 import type { ServerNotice as ServerNoticeType } from '@modrinth/utils'
-import { useVIntl } from '@vintl/vintl'
 import dayjs from 'dayjs'
 import { computed } from 'vue'