qTranslate does not work in WordPress 4.0

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, [...]