If you don't want to launch pinta from a terminal, steps like https://apple.stackexchange.com/a/424695 could be used to set the LANG environment variable globally might work (and may require a reboot after to take effect)
If you don't want to launch pinta from a terminal, steps like https:/ /apple. stackexchange. com/a/424695 could be used to set the LANG environment variable globally might work (and may require a reboot after to take effect)