change shortcut modal header color

src/server/views/modal/shortcuts.html

@@ -2,7 +2,7 @@
   <div class="modal-dialog modal-lg">
     <div class="modal-content">
 
-      <div class="modal-header text-light">
+      <div class="modal-header bg-primary text-light">
         <div class="modal-title">{{ t('Shortcuts') }}</div>
         <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
       </div>