fix(strings): fix reset password link error messages

The invalid and expired error messages were using verification link strings and markup
when they should use reset password strings and markup.
feat(client): add expired verification link message and a email resend link
Merge pull request #1273 from mozilla/issue-977-expired-verification-link

Issue 977 expired verification link

Thanks for working through this with me @zaach!

r+
refactor(client): Add a timer-mixin that takes care of setTimeout housekeeping.
Convert modules to use timer-mixin.setTimeout
Move timer-mixin into views/mixins subdirectory.