Admin Section: misc templates corrections and improvments

* reset admin vertical menu custom styles
* disable icons in admin vertical menu
* fix main content positioning in admin section
* fix table appearance in admin crud template
* new scope/center form: move submit button in record_action sticky area
* edit scope/center form: move submit button in record_action sticky area
* improve homogeneity in admin index pages: centers/scopes/users/jobs
* remove centered div old tags

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

@@ -40,7 +40,7 @@ class AdminLanguageMenuBuilder implements LocalMenuBuilderInterface
             ->setAttribute('class', 'list-group-item-header')
             ->setExtras([
                 'order' => 1200,
-                'icons' => ['globe-w'],
+                //'icons' => ['globe-w'],
             ]);
         $menu->addChild('Language list', [
             'route' => 'chill_crud_main_language_index',

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

@@ -40,7 +40,7 @@ class AdminLocationMenuBuilder implements LocalMenuBuilderInterface
             ->setAttribute('class', 'list-group-item-header')
             ->setExtras([
                 'order' => 1300,
-                'icons' => ['map-marker'],
+                //'icons' => ['map-marker'],
             ]);
 
         $menu->addChild('Location type list', [

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

@@ -46,7 +46,7 @@ class AdminUserMenuBuilder implements LocalMenuBuilderInterface
             ->setAttribute('class', 'list-group-item-header')
             ->setExtras([
                 'order' => 1000,
-                'icons' => ['key'],
+                //'icons' => ['key'],
             ]);
 
         $menu->addChild('Center list', [