Correctly display Flow in RTL interface and content
There are two types of directionalities Flow should adhere to -
content language and interface language. CSSJanus flips directions
dependent on interface language, but some of those operations are
not correct, since they are content-dependent. For instance, the
topic subject is content-dependent regardless of the interface.
For those content dependent cases, make sure the display flips
between content directionalities and add @noflip rules so that
CSSJanus does not touch those regardless of interface.
On top of that there are several elements that should flip for
interface values, like the flow-board-navigation elements. For
those to work properly we have to add LTR rules so CSSJanus flips
those in RTL.