Coursepress translation

Dear all,
I have installed Coursepress. I want to use it in Czech language.
I used poedit to translate the most important words/phrases.
I named the files cp-cs_CZ.po and cp-cs_CZ.mo.
I copy it to the folder wp-content/languages/plugins.
I have set general wordpress to czech too (Settings/general/language czech).
But nothing has changed.

I also tried to copy the files to these folders wp-content/languages/ and wp-content/plugins/coursepress/languages/. But still no success.
Could you help me please?
Thank you very very much,
Zuzana