Switch to using a common runtime chunk rather than locales

app/javascript/locales/index.js

@@ -1,22 +0,0 @@
-let theLocale;
-
-export function setLocale(locale) {
-  theLocale = locale;
-}
-
-export function getLocale() {
-  return theLocale;
-}
-
-export function onProviderError(error) {
-  // Silent the error, like upstream does
-  if(process.env.NODE_ENV === 'production') return;
-
-  // This browser does not advertise Intl support for this locale, we only print a warning
-  // As-per the spec, the browser should select the best matching locale
-  if(typeof error === "object" && error.message.match("MISSING_DATA")) {
-    console.warn(error.message);
-  }
-
-  console.error(error);
-}