[Pushed] [polish translation] no lang for error login input after send empty register form

[Poftorek]

Hello
With polish translation:

After we send empty register form, login input error is in english instead of polish just like others. Probably is hardcoded instead of placing it in langs.

[JordanMussi]

Hi,

Thank you for your report. We have pushed this issue to our Github repository for further analysis where you can track our commits and progress with fixing this bug. Discussions regarding this bug may also take place there too.

Follow this link to visit the issue on Github: https://github.com/mybb/mybb/issues/4103

Thanks for contributing to MyBB!

Regards,
The MyBB Group