UX: Make moment.js produce Arabic numerals instead of Hindi numerals in the Arabic locale (#11788)

Signed-off-by: OsamaSayegh <asooomaasoooma90@gmail.com>

app/assets/javascripts/locales/ar.js.erb

@@ -1,3 +1,11 @@
 //= depend_on 'client.ar.yml'
 //= require locales/i18n
 <%= JsLocaleHelper.output_locale(:ar) %>
+
+// original moment.js implementation can be found here:
+// https://github.com/moment/moment/blob/b7ec8e2ec068e03de4f832f28362675bb9e02261/locale/ar.js#L185-L191
+moment.updateLocale("ar", {
+  postformat(string) {
+    return string;
+  }
+});