made campus import look better, see #148

templates/import_campus.html

@@ -51,7 +51,7 @@
 			<h1 class="panel-title">
 				Fehlende Termine:
 				<ul class="list-inline pull-right">
-					<li><a class="btn btn-default" href="{{url_for('import_from', id=course['id'])}}">Campus überprüfen (Warnung: dauert lange)</button></a>
+					<li><a class="btn btn-default" href="{{url_for('import_from', id=course['id'])}}"><span class="fa fa-refresh" aria-hidden="true" ></span> Aktualisieren</button></a>
 					<li><button class="btn btn-default" onclick="$('.newlecture').click(); alert(\"done\");">alle anlagen</button></li>
 				</ul>
 			</h1>