Add Basque language ('eu') (#7479)

* Add Basque language

* Contributor's changes

src/locale/i18n.ts

@@ -19,6 +19,7 @@ import {messages as messagesEl} from '#/locale/locales/el/messages'
 import {messages as messagesEn} from '#/locale/locales/en/messages'
 import {messages as messagesEn_GB} from '#/locale/locales/en-GB/messages'
 import {messages as messagesEs} from '#/locale/locales/es/messages'
+import {messages as messagesEu} from '#/locale/locales/eu/messages'
 import {messages as messagesFi} from '#/locale/locales/fi/messages'
 import {messages as messagesFr} from '#/locale/locales/fr/messages'
 import {messages as messagesGa} from '#/locale/locales/ga/messages'
@@ -106,6 +107,14 @@ export async function dynamicActivate(locale: AppLanguage) {
       ])
       break
     }
+    case AppLanguage.eu: {
+      i18n.loadAndActivate({locale, messages: messagesEu})
+      await Promise.all([
+        import('@formatjs/intl-pluralrules/locale-data/eu'),
+        import('@formatjs/intl-numberformat/locale-data/eu'),
+      ])
+      break
+    }
     case AppLanguage.fi: {
       i18n.loadAndActivate({locale, messages: messagesFi})
       await Promise.all([