NL language doen’t load

Hello, I’ve installed your plugin and works fine. I would like te translate the word “views” to “vertoningen”. I’ve changed it in the .po and .mo files.

wordpress-popular-posts-nl-NL.mo
wordpress-popular-posts-nl-NL.po

These two are uploaded in the languages/plugins folder but noting change…
The language setting og the normal wordpress site are NL.

Do I have to change another file? Hop u can help. Thanks in advance!