add rewind and forward button

[nums]

I added 2 buttons to the ui that allow you to quickly move forward or backward in the video (like the video player on ios) I updated the doc with the information I also added the French language.

Just one thing, I couldn't update the icon typography, so I put icons "by default"

[matvp91]

Thank you for your PR! I'll have it reviewed by the end of this week.

Edit: @nums, I'm sorry I didn't get to it yet. I'm on holidays at the moment and haven't had much time to grab my pc, none in fact. Stay tuned and I'll get back to your PR asap. :)

[nums]

Hello,

do you have any news for this pull request ?

Thanks, Emmanuel

[beyondlevi]

Any news about this PR? This features are amazing and a must have.