FEATURE: Site settings defaults per locale

This change-set allows setting different defaults for different locales. 

It also:

- Adds extensive testing around site setting validation

- raises deprecation error if site setting has the default property based on env

- relocated site settings for dev and tests in the initializer

- deprecated client_setting in the site setting's loading process

- ensure it raises when a enum site setting being set

- default_locale is promoted to `required` category.

- fixes incorrect default setting and validation

- fixes ensure type check for site settings

- creates a benchmark for site setting

- sets reasonable defaults for Chinese

app/assets/javascripts/admin/components/site-setting.js.es6

@@ -52,16 +52,16 @@ export default Ember.Component.extend(BufferedContent, {
   }.on("willDestroyElement"),
 
   _save() {
-    const self = this,
-          setting = this.get('buffered');
-    SiteSetting.update(setting.get('setting'), setting.get('value')).then(function() {
-      self.set('validationMessage', null);
-      self.commitBuffer();
-    }).catch(function(e) {
+    const setting = this.get('buffered'),
+      action = SiteSetting.update(setting.get('setting'), setting.get('value'));
+    action.then(() => {
+      this.set('validationMessage', null);
+      this.commitBuffer();
+    }).catch((e) => {
       if (e.jqXHR.responseJSON && e.jqXHR.responseJSON.errors) {
-        self.set('validationMessage', e.jqXHR.responseJSON.errors[0]);
+        this.set('validationMessage', e.jqXHR.responseJSON.errors[0]);
       } else {
-        self.set('validationMessage', I18n.t('generic_error'));
+        this.set('validationMessage', I18n.t('generic_error'));
       }
     });
   },

app/assets/javascripts/admin/models/site-setting.js.es6

@@ -48,7 +48,7 @@ SiteSetting.reopenClass({
   update(key, value) {
     const data = {};
     data[key] = value;
-    return ajax("/admin/site_settings/" + key, { type: 'PUT', data });
+    return ajax(`/admin/site_settings/${key}`, { type: 'PUT', data });
   }
 });