Set editor mode of Sass files

UI/WebServerResources/scss/components/content/content.scss

@@ -1,11 +1,10 @@
-/// content.scss -*- Mode: text; indent-tabs-mode: nil; basic-offset: 2 -*-
+/// content.scss -*- Mode: scss; indent-tabs-mode: nil; basic-offset: 2 -*-
 @import 'extends';
 
 // angular-material is mobile first (is it ?) SOGo is not. We're inversing
 // the media definitions and replacing magic numbers with variables
 // ----------------------------------------------------------------------------
 md-content {
-
   display: block;
   position: relative;
   overflow: auto;