User guide RTL

[Frenzie]

To investigate after update.

Looks like it used to work: #50 (or maybe that was just wishful thinking)

Edit: actually it's already fine for Hebrew, but not for Arabic.

145d608

Edit 2: the translation for en was wrong in Arabic (should be ar, not en). Needs a translator comment if possible.

[yarons]

I see that Russian is quite funky, the translation there is Англ (Short form of the word English in Russian) instead of simply "ru".

[Frenzie]

I'll fix it up after the big content update soon.