function fillBoxes()
{
...
//insert category and label
// -- label --
// Add this lines
try {
cattext = eval("opt"+cat[i]+"[Language]");
} catch(err) {
cattext = cat[i];
}


txt += '<label class="category" ';
txt += 'for="' + cat[i][0] + '" ';
txt += 'onclick="toggleChecked(\'' + cat[i] + '\'); checkCategory(\'' + cat[i] + '\');" ';
txt += '/>' + cattext + '</label>'; // <-- REPLACE cat[i][0] with cattext
// -- category --
if (!DisableCatCheckBoxes)
{
....
}