Translating by locotranslate

Hello. I have a problem with the translation by locotranslate. I downloaded the translation, installed the locotranslate plugin. I set the language in wordpres settings, turned on locotranslate. Then I selected the woodmart skin and selected the “upload po” button. The file uploaded to themes/woodmart/languages/pl.po, I can see how many things are translated, but nothing has changed on the website.
If I delete the file and want to translate manually by locotranslate, the changes are visible. I don’t know what I’m doing wrong.