French translation + One (optional) change in fullscreen behavior

[kekh]

Hi,

Here is my first contribution to this awesome (and probably the most helpful) Firefox extension.
About the small change, I've just added a preference to collapse or not the tab bar when switch to fullscreen...
And I have few other ideas for later!

Cheers, and thank you so much for keeping TK alive and active!

[PikachuEXE]

Thanks for contributing!
I think it's best to only have one kind of change in one Pull Request to make it easier to be reviewed.
Can you change this PR to only have the fullscreen behavior change first?
You can submit the French translation later :)

[kekh]

Well I don't how to do that from the Github GUI :-/
Anyway I made 2 distincts commits so is not that enough adequate for you review it? If not, please explain to me how to edit or delete this pull request, I begin with Git... Thanks!

[PikachuEXE]

Open a new branch, then cherry pick the commit(s) you want.
When the branch is ready, push to GitHub, then go the your repo's page and start another Pull Request.