R1:9b15aa195e2f

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