i18n : Add french translation (1/2)

[Potjoe-97]

Add french translation to the project.

[eliandoran]

@Potjoe-97 , thank you for your contribution, I'll have a look at it this evening.

However please note that there are also quite a few translations to be added on the client side as well. You can find these translations in src/public/translations.

[Potjoe-97]

Hi ! I just noticed the second file. Now that I have everything setup in VS, I can start the translation of 'src/public/translations'.

[eliandoran]

Thank you for your contribution. If you have any other changes, feel free to open a new PR.

[eliandoran]

@Potjoe-97 ,

I've added the French language in settings. If you wish to have a look, I've triggered the nightly build which should update https://github.com/TriliumNext/Notes/releases/tag/nightly soon.

[Potjoe-97]

@eliandoran I'm polishing the translation (sorry for the many commits, i'm a git beginner). I think I'll finish the translation for this weekend ! I'll make a new PR to update it.