Mobile apps don't substitute these values so set them to zero length
strings.
Also, the iOS app sets the base text direction via the "dir" parameter
so add handling of that parameter in cool.html. TODO: check if the
Android and GTK apps need to implement the "dir" parameter to handle
RTL layout.
Signed-off-by: Patrick Luby <patrick.luby@collabora.com>
Change-Id: Ied8268ec256011281961ef610d53baeee0efe9cd
