Field class is not required anymore in Activity view

templates/activities_add_update.html.tpl

@@ -64,7 +64,7 @@
     
     <div class="form-group">
       <label class="control-label" for="class_id">Classe</label>
-      <select name="class_id" class="form-control selectpicker" id="class_id" placeholder="Materia" data-live-search="true" form="form_activities_add_update" title="Seleziona il nome della materia" data-dropup-auto="false" required>
+      <select name="class_id" class="form-control selectpicker" id="class_id" placeholder="Classe" data-live-search="true" form="form_activities_add_update" title="Seleziona la classe" data-dropup-auto="false">
 	<option value="0"></option>
   	{{range $class := .Data.AllClasses}}
 	{{if $.Options.Get "update"}}