you can create EN firmware too, just select translate to English
1. Create modded firmware -
Index - MB3Editor
Select default language for editing >
Polish
✔️Translate Firmware? >
English
✔️ Set default language?
✔️ Change number of notifications?
✔️ Use notifications fix?
2. Edit Resource -
Index - MB3Editor
Select default language in firmware >
Polish
✔️Add translate days? Select language for days >
Days EN