Index: branches/5.2.x/core/admin_templates/regional/languages_export.tpl
===================================================================
diff -u -N -r15614 -r15858
--- branches/5.2.x/core/admin_templates/regional/languages_export.tpl	(.../languages_export.tpl)	(revision 15614)
+++ branches/5.2.x/core/admin_templates/regional/languages_export.tpl	(.../languages_export.tpl)	(revision 15858)
@@ -101,10 +101,10 @@
 							function () {
 								$('#btn-select-all, #btn-unselect').click(
 									function ($e) {
-										var $checked = $(this).attr('id') == 'btn-select-all' ? 'checked' : '';
+										var $checked = $(this).attr('id') == 'btn-select-all';
 										var $reg_exp = /^<inp2:phrases.export_InputName field='Module' as_preg='1'/>_([0-9A-Za-z-]+)/;
 
-										$("input[type='checkbox']", '#modules').attr('checked', $checked);
+										$("input[type='checkbox']", '#modules').prop('checked', $checked);
 										update_checkbox_options($reg_exp, '<inp2:phrases.export_InputName field='Module'/>');
 									}
 								);