how to translate?

Hello,
There is a language folder of this plugin, and also there is a language folder of "default theme" which is a sub-folder of this plugin. I have translated the directory.po file and rename it as "directory-tr_TR.po" and i have put "directory-tr_TR.mo" file to the languages folder. Bu it did not work. How can i solve this problem? Sorry for mey english.
Thanks...