Complete Polish translation based on English file

[jelveh]

The Polish translation file (pl.js) needs to be updated to include all translations present in the English file (en.js). Currently, the Polish translation may be incomplete or outdated compared to the English version.

Steps to resolve

1. Compare the contents of src/gui/src/i18n/translations/en.js and src/gui/src/i18n/translations/pl.js
2. For each translation key in en.js, ensure a corresponding translation exists in pl.js
3. If a translation is missing in pl.js, add it with an appropriate Polish translation
4. If any translations in pl.js are outdated or incorrect, update them to match the current English version

Additional notes

• Please ensure that the translations are culturally appropriate and maintain the intended meaning of the English text
• If certain terms or phrases don't have a direct Polish equivalent, consider adding translator notes or using transliteration where appropriate

Files to be updated

• src/gui/src/i18n/translations/pl.js

Related files

• src/gui/src/i18n/translations/en.js (reference file)

Thank you for helping to improve the Polish localization of our project!

[jelveh]

Completed via #598