I want to help translate it to polish

But i don't know how to start doing it...
Should I edit sources? Maybe is program to translating?

Detailed information is given in http://www.kdenlive.org/contribution-manual
Here: http://www.kdenlive.org/contribution-manual/how-translate-kdenlive

If some information is missing, please reply in the how to translate Kdenlive page and we add information to the page.

Thanks !
I am looking forward to do translation to romanian.