For interlanguage toggle, interlanguage position is no longer assumed to be a
left sidebar, and is determined on the fly in order to appear correctly
regardless of where it is, and not go off the side of the page. This works
across most skins, and regardless of language directionality.
Does not necessarily resolve issues with interlanguage links appearing in the
middle of the page (header/footer), or the callout just plain not fitting for
other reasons (mobile devices).
bug: T161586
Change-Id: Icd55498a945e12c0ff79ba891c094d60ce791115
1d395d4966