IE8 filters compatibility

flask_admin/static/admin/js/filters.js

@@ -104,7 +104,7 @@ var AdminFilters = function(element, filtersElement, filterGroups) {
     }
 
     $('a.filter', filtersElement).click(function() {
-        var name = $(this).text().trim();
+        var name = ($(this).text().trim !== undefined ? $(this).text().trim() : $(this).text().replace(/^\s+|\s+$/g,''));
 
         addFilter(name, filterGroups[name]);