Persist UI settings, add missing localizations for German

app/assets/javascripts/components/actions/settings.jsx

@@ -0,0 +1,17 @@
+import axios from 'axios';
+
+export const SETTING_CHANGE = 'SETTING_CHANGE';
+
+export function changeSetting(key, value) {
+  return (dispatch, getState) => {
+    dispatch({
+      type: SETTING_CHANGE,
+      key,
+      value
+    });
+
+    axios.put('/api/web/settings', {
+      data: getState().get('settings').toJS()
+    });
+  };
+};