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/languages.ts

@@ -9,6 +9,7 @@ export enum AppLanguage {
   an = 'an',
   ast = 'ast',
   ca = 'ca',
+  cy = 'cy',
   da = 'da',
   de = 'de',
   el = 'el',
@@ -53,6 +54,7 @@ export const APP_LANGUAGES: AppLanguageConfig[] = [
   {code2: AppLanguage.an, name: 'Aragonés – Aragonese'},
   {code2: AppLanguage.ast, name: 'Asturianu – Asturian'},
   {code2: AppLanguage.ca, name: 'Català – Catalan'},
+  {code2: AppLanguage.cy, name: 'Cymraeg – Welsh'},
   {code2: AppLanguage.da, name: 'Dansk – Danish'},
   {code2: AppLanguage.de, name: 'Deutsch – German'},
   {code2: AppLanguage.el, name: 'Ελληνικά – Greek'},