Refactor i18n functions a bit

ui/src/i18n/useGetLanguageChoices.js

@@ -0,0 +1,19 @@
+// React Hook to get a list of all languages available. English is hardcoded
+import { useGetList } from 'react-admin'
+
+export default () => {
+  const { ids, data, loaded, loading } = useGetList(
+    'translation',
+    { page: 1, perPage: -1 },
+    { field: '', order: '' },
+    {}
+  )
+
+  const choices = [{ id: 'en', name: 'English' }]
+  if (loaded) {
+    ids.forEach((id) => choices.push({ id: id, name: data[id].name }))
+  }
+  choices.sort((a, b) => a.name.localeCompare(b.name))
+
+  return { choices, loaded, loading }
+}