Everything visible should already be translated into Polish. However, I was not able to check how the translations of all errors are displayed (because how to display them if there is no error?), so I'm not sure that they are ok.
BTW, there are still many error messages hardcoded (e.g. "Local IP is required"). I think we should translate them as well.
Strange, but if i use capital letters in Polish translation for "ON' and "OFF" (local_translations.h), I'm getting compile error. So instead of whole words in capital letters I used abbreviations in lower case (more useful, IMHO)
