Improve various Phame UI things
Summary:
- Clean up the menu selection states.
- Nuke some unused code.
- Show some more contextual error messages.
- Improve/pht() some strings.
Test Plan: Looked at post/blog list, empty state of "new post".
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T1373
Differential Revision: https://secure.phabricator.com/D3706