Hi, today I tested Dokuwiki (devel) on another system. On this system Dokuwiki doesn't accept any laguage than english. The plugins were localized but the mainstream code not. After some investigation I found following line in inc/init.php if ( defined($conf['lang']) ) { The problem here is that defined() only works on constants but $conf[] is a variable. Replacing the line with the following solved the problem: if ( isset($conf['lang']) ) { The attached patch does exactly this. Best Regards Matthias