A fix for arrow movements in RTL wikis.

This will make sure the marker moves correctly (backwards/forward)
in RTL languages as well as LTR languages, judging from the wiki pageLanguage.
This can be a quickfix until the movement can be decided per the direction
of the specific element (span/paragraph/div) the marker is in.

Bug: 38546
Change-Id: Ic01e110a5e6094cd275327a2e8cea90c900f1bd1
Merge "A fix for arrow movements in RTL wikis."