Add language: Frisian (#8214)

* Update app.config.js

* Update lingui.config.js

* Update dates.ts

* Update helpers.ts

* Update i18n.ts

* Update i18n.web.ts

* Update languages.ts

* Create messages.po

src/components/hooks/dates.ts

@@ -21,6 +21,7 @@ import {
   eu,
   fi,
   fr,
+  fy,
   gd,
   gl,
   hi,
@@ -66,6 +67,7 @@ const locales: Record<AppLanguage, Locale | undefined> = {
   eu,
   fi,
   fr,
+  fy,
   ga: undefined,
   gd,
   gl,