Add French Translation

Basic (not so great probably) French Translation. My French grammar skills are really bad.

Haven't had the opportunity to set up the whole latex-pdf pipeline yet.

added 2 commits

• 4a273862 - 1 commit from branch postmarketOS:master
• 49895427 - Add French Translation

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added help wanted label

Thanks for the translation.

Could you also create a pdf version? that would make reviews easier

Thank you so much for the translation!