Support RTL languages #869
Description
We have Fluent support for localizing the website, but I suspect the website would look terrible for any RTL language.
CSS is powerful enough that we should be able to do this just using CSS (i.e, we shouldn't have to generate different per-language layouts, we generate the same layout with different CSS being applied).
One way to start is to generate a testing localization like xx-AU that's basically English marked as RTL. (Android used to have a cibarA localization for this). Then, start going through and seeing what's broken, and fixing it with the appropriate CSS.
It might just help to start an Arabic/Hebrew translation team first so they can start reporting bugs.