Add a "about" section into the burger-menu with some information

[natrius]

A lot of apps add a "about" into the burger menu to look at the licencing and the version number and so on.

The other version that could be done is add the version at the bottom in the burger-menu.

[Moustachauve]

Good idea, I'll be implementing this in the near future!

[Kolan04]

Such a great idea, and also add a "Languages" tab, I will help with the translation into Ukrainian for free.