Modernize Slowvote, fix Badges mobile menu

Summary: Uses modern methods in Slowvote, adds appmenu, consistent create into Badges

Test Plan: View Poll list, new poll, edit poll, vote in poll.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T9690

Differential Revision: https://secure.phabricator.com/D14592