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My system language is English, but when i opening ,,File->New From Photos" all is spain or italian language ,,momentos,colecciones"....
Is the rest of Pixelmator Pro in English for you? In general, the language is set according to your preferred languages in System Preferences > Language & Region. So it might be a good idea to check out the order of languages there and see if any languages you don't need haven't appeared there by accident. More details on this are available on the following Apple support page:
Yes rest of Pixelmator pro is English. In Languages & Region Primary language Lithuanian ,second English. Changing to Enhlish didnt help.
All in my "Photos" app is English.