WordPress crash after update to 2.6.3

In that line I see:
if(qtrans_getLanguage()=='es') {

Can you check that in the file mqtranslate/mqtranslate_utils.php, you get this:

function qtrans_getLanguage() {
...
}

Yes, it apears like this:

[ Moderator note: code fixed. Please wrap code in the backtick character or use the code button. ]

function qtrans_getLanguage() {
    global $q_config;
    return $q_config['language'];
}