[bug 828471] Mobile optimized activation page
[bug 824828] Mobile optimize reset password pages
Increase delta to make test more likely to pass on ci

Jenkins semi-regularly fails these tests because the times end up just
outside the delta. The tests are for making sure that the fields get
auto updated. It doesn't really matter a whole lot if the delta
is minute or not.
Handle {foo} Python formatting syntax.
Remove more of old mobile leftovers.