Improve name selection with the query tool

Pass the full expanded list of preferred languages to the client
and use that when looking for the best name for an object.

Fixes #4310

app/assets/javascripts/application.js

@@ -124,6 +124,7 @@ $(document).ready(function () {
   I18n.fallbacks = true;
 
   OSM.preferred_editor = application_data.preferredEditor;
+  OSM.preferred_languages = application_data.preferredLanguages;
 
   if (application_data.user) {
     OSM.user = application_data.user;

app/assets/javascripts/index/query.js

@@ -125,7 +125,7 @@ OSM.Query = function (map) {
 
   function featureName(feature) {
     var tags = feature.tags,
-        locales = I18n.locales.get();
+        locales = OSM.preferred_languages;
 
     for (var i = 0; i < locales.length; i++) {
       if (tags["name:" + locales[i]]) {

app/helpers/application_helper.rb

@@ -48,7 +48,8 @@ module ApplicationHelper
   def application_data
     data = {
       :locale => I18n.locale,
-      :preferred_editor => preferred_editor
+      :preferred_editor => preferred_editor,
+      :preferred_languages => preferred_languages.expand.map(&:to_s)
     }
 
     if current_user