Fix missing generic font family (#32890).

Patch by Marius BALTEANU.


git-svn-id: http://svn.redmine.org/redmine/trunk@19474 e93f8b46-1217-0410-a6f0-8f06a7374b81

public/stylesheets/responsive.css

@@ -261,7 +261,7 @@
 
   /* search magnifier icon */
   .search-magnifier {
-    font-family: Verdana;
+    font-family: Verdana, sans-serif;
     color: #bbb;
 
     cursor: pointer;