Use font awesome instead of png icon

Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/static/loader-bootstrap.js

@@ -746,9 +746,14 @@ $(function () {
         titleFormat: "MM yyyy"
     };
 
-    /* Override all multiple selects */
+    /* Override all multiple selects, use font awesome for exchange icon */
     $('select[multiple]').each(function () {
         $(this).multiSelect({
+            afterInit: function (target) {
+                $(target.children()[0]).after(
+                    '<div class="fa-multiselect"><i class="fa fa-exchange"></i></div>'
+                );
+            }
         });
     });
 });

weblate/static/style-bootstrap.css

@@ -242,3 +242,13 @@ img.engage-icon {
 .fa-wl-social {
     padding: 7px;
 }
+.ms-container{
+  background: none !important;
+}
+.fa-multiselect {
+  height: 200px;
+  line-height: 200px;
+  float: left;
+  vertical-align: middle;
+  padding-left: 10px;
+}