A very popular translation plugin qTranslate has not been updated after 2014-1-26 which is compatible up to WordPress 3.8.3. After upgrading WordPress, the plugin qTranslate does not work. But it is difficult for website owners to change to other plugins.
I have a simple compatibility fix for the plugin qTranslate with WordPress 4.0 below. For sure, code changes are required.
A. Enable the plugin which is upper than WordPress 3.8.1
Edit the file ./wp-content/plugins/qtranslate/qtranslate.php at line 90
B. Fix the date format
It is noticed that the date in the Dashboard cannot display correctly but some strange code instead like Nov 7th %I:%M %p
To fix it, edit the file ./wp-content/plugins/qtranslate/qtranslate_core.php at line 455
return $before.strftime($format, $date).$after;
$format = strftime($format, $date); return $before.strftime($format, $date).$after;
After changes, it should work properly. If you have encountered any problems after fixes, please let me know.