FEATURE: rewrite widgets management into new layout

resources/lang/en/admin/widgetAreas.php

@@ -3,6 +3,7 @@ return [
     'new'                 => 'New widget area',
     'name'                => 'Widget area name',
     'code'                => 'Unique code',
+    'uniqueCode'          => 'Unique code',
     'description'         => 'Description',
     'createNew'           => 'Create new widget area',
     'successfullyCreated' => 'Widget area successfully created',
@@ -12,6 +13,7 @@ return [
     'actions'             => 'Actions',
     'noEntries'           => 'No widget areas defined yet. Try to create some first.',
     'editButton'          => 'Edit',
+    'save' => 'Save',
     'edit'                => 'Editing widget area :name',
     'editSuccessfull'     => 'Successfully edited'
 ];