docs: Moving internationalized versions of multi-window doc

For each of the localized languages, moving the multi-window preview
doc to its new location. Not attempting to update the doc for release,
aside from fixing a single image link--that will be left to the
translators.

Also changed the "qv-wrapper"/"qv" divs to "tb-wrapper"/"tv".

bug: 30407407

Change-Id: I01e4ca63e8f3972971067eb44546a8e1b3eec0e0