[t] (1) Allow <input type=button value> to be translated, since that value isn't submitted
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=23842
Affected topics: HTML

git-svn-id: http://svn.whatwg.org/webapps@8311 340c8d12-0b0e-0410-8428-c7bf67bfef74