admin: add fa icons to menu section title

src/Bundle/ChillMainBundle/Routing/MenuBuilder/AdminLanguageMenuBuilder.php

@@ -38,8 +38,10 @@ class AdminLanguageMenuBuilder implements LocalMenuBuilderInterface
             'route' => 'chill_main_language_admin',
         ])
             ->setAttribute('class', 'list-group-item-header')
-            ->setExtras(['order' => 1200]);
-
+            ->setExtras([
+                'order' => 1200,
+                'icons' => ['globe-w'],
+            ]);
         $menu->addChild('Language list', [
             'route' => 'chill_crud_main_language_index',
         ])->setExtras(['order' => 1210]);

src/Bundle/ChillMainBundle/Routing/MenuBuilder/AdminLocationMenuBuilder.php

@@ -38,7 +38,10 @@ class AdminLocationMenuBuilder implements LocalMenuBuilderInterface
             'route' => 'chill_main_location_admin',
         ])
             ->setAttribute('class', 'list-group-item-header')
-            ->setExtras(['order' => 1300]);
+            ->setExtras([
+                'order' => 1300,
+                'icons' => ['map-marker'],
+            ]);
 
         $menu->addChild('Location type list', [
             'route' => 'chill_crud_main_location_type_index',

src/Bundle/ChillMainBundle/Routing/MenuBuilder/AdminUserMenuBuilder.php

@@ -38,7 +38,10 @@ class AdminUserMenuBuilder implements LocalMenuBuilderInterface
             'route' => 'chill_main_user_admin',
         ])
             ->setAttribute('class', 'list-group-item-header')
-            ->setExtras(['order' => 1000]);
+            ->setExtras([
+                'order' => 1000,
+                'icons' => ['key'],
+            ]);
 
         $menu->addChild('Center list', [
             'route' => 'admin_center',