New ppdippstr.py, update of all the po files and new strings translated in the fr.po

[LAfricain]

I work still on the ppd translation file, and I directly update the po files with intltool. Please make sure all was well done :)

[zdohnal]

Hi, thank you for the pull request, but I'm trying to create new release now and I don't want to add more things, which can possibly break something - I'll merge after I release new version.