Add language: Welsh (#7866)

* Create messages.po

* Update app.config.js

* Update lingui.config.js

* Update dates.ts

* Update helpers.ts

* Update i18n.ts

* Update i18n.web.ts

* Update languages.ts

src/locale/i18n.ts

@@ -14,6 +14,7 @@ import {AppLanguage} from '#/locale/languages'
 import {messages as messagesAn} from '#/locale/locales/an/messages'
 import {messages as messagesAst} from '#/locale/locales/ast/messages'
 import {messages as messagesCa} from '#/locale/locales/ca/messages'
+import {messages as messagesCy} from '#/locale/locales/cy/messages'
 import {messages as messagesDa} from '#/locale/locales/da/messages'
 import {messages as messagesDe} from '#/locale/locales/de/messages'
 import {messages as messagesEl} from '#/locale/locales/el/messages'
@@ -78,6 +79,14 @@ export async function dynamicActivate(locale: AppLanguage) {
       ])
       break
     }
+    case AppLanguage.cy: {
+      i18n.loadAndActivate({locale, messages: messagesCy})
+      await Promise.all([
+        import('@formatjs/intl-pluralrules/locale-data/cy'),
+        import('@formatjs/intl-numberformat/locale-data/cy'),
+      ])
+      break
+    }
     case AppLanguage.da: {
       i18n.loadAndActivate({locale, messages: messagesDa})
       await Promise.all([