No i did not change anything. 
Just a update of joomla but after the problem occurred.
Strange thing is that when i set search friendly url enabled the translation of the articles fails as well.
 
Version   
Library Version: 1.3.1
Joomla Version 3.4.4 is unkown.
Plugin   
JDiction Plugin is enabled
Languagefilter is enabled
Multiple Plugins have the same loading position (0)
Database   
jDiction Database Driver is selected
Language   
Translations are not equal to frontend translations.
Module   
Module is enabled
Common mistakes   
It seems that there are no common mistakes.