The GPL license, as it affects most people, is simple:
1. Include the source when you send someone the program.
2. Any changes you make to the program must be licensed under the GPL.
The actual license has to say a lot more to ensure it is legally binding and to cover borderline cases, and it is unfortunate but understandable that a non-profit group like the Free Solftware Foundation will only officially support one language.
GPL programs are copyright protected. If copyright is recognized somewhere, but an English license is not legal, then it is a violation to use GPL software at all.
I am not a lawyer, this is just my understanding.