Fix lang_path in translation.php/_get_lang_files

Fixed problem with broken lang_path.
If directory name contains translation language, then the language part removed from name and the module Static translations works wrong.
For example, path '/path/to/DOMAIN.ru/themes/adaptive/' was processed to '/path/to/DOMAIN.themes/adaptive/' and the module can't read files in hemes/adaptive/ru/anyfile_lang.php