i fist of all you need to create the .po and .mo file and from the installation page of wordpress there is wp-config.php file define('WPLANG', '');
Default its blank. For example for english language its define('WPLANG', 'en_US');
Hope you got it what i mean.
thank you very much but I don’t mean the wordpress language.
Under the path “/wp-content/themes/interface-pro/languages” is a file called “interface.pot” but there is all text in english.
It would be great to change the language for the whole theme to german without modify every line manually.