Change web GUI for right-to-left writing

This would allow for new languages like to Arabic, Hebrew, Persian, etc.

Does anyone have experience with right-to-left web design? What needs to be changed in HTML or can it all be done with CSS?

I don’t speak any of these languages and I don’t want to display :smiling_imp: messages or show :hankey: because the letters are displayed in the wrong order. Also I have to check if transifex allows to change input direction.