Hi, @stolarczykp.
I’m glad you reached out. I can certainly help you with it.
What you need to do here is translate the plugin to your language.
Translation for GiveWP is handled in two different ways: one is for the main plugin and the other for premium add-ons.
The main GiveWP plugin available on the www.ads-software.com plugin directory is translated by the (largely volunteer) team at the official translation page for the WordPress project. Here’s the specific page for GiveWP: https://translate.www.ads-software.com/projects/wp-plugins/give
We as a company don’t have control over those translation files, though we can make suggestions and contributions there just like anyone else. I’d encourage you to get involved there to make GiveWP translations the best they can be.
The premium add-ons, because they are not on the official WordPress directory, have to handle translations differently. A handful of our add-ons ship with translation files (PO and MO files) but as most of our team is not multilingual enough to manage translations, we rely on others to provide translations for GiveWP add-ons. The most established way to do that is with a program called Poedit: https://poedit.net/download
If you want to translate the files just for your site, you can also use a plugin called Loco Translate: https://www.ads-software.com/plugins/loco-translate/
We have documentation about how you can do that here https://givewp.com/documentation/resources/translating-give/translating-givewp-with-loco-translate/
Thanks for using GiveWP! Have a great day.