cherypick from jb-dev Change-Id: Ifcae4fcf716c8bb48f3ff18f17313b3f131c3f73
refactor the logic for changing languages in global strings.
instead of using separate <span> elements for each language,
provide a unique attribute in each <a> element for each localized
version of that link's title.
Change-Id: I09c65a8dce9b3d9623e32fe17876b055e452618b
cherrypick from jb-dev Change-Id: I90412e1e03a2676d927796187fe811481bf38455
add localize langs for global strings
Change-Id: I02b6c5b5d83247a352dc041e9885befe82502adc
Add a custom version of docpage.cs to the droiddoc template, because
it adds a good deal of custom design and behavior (instead of updating
the doclava version of the file). Add CSS for next/previous links in
android u lessons and revise style for download button.
Change-Id: I829c4fb134d6f5c3cee82fb86958d23ef64e8481
