Translation file doesn’t work

hi,
first i download my language files by module’s button, everything was ok but translation is not perfect so i edit file with new language which is located here:
wp-content/languages/plugin/ultimatemember-pl_PL.po

After edit the file doesn’t replace correct sentence into Ultimate Member on my site.

I tried copy language’s files to direct module folder (languages) but the same..not working. Please help me.