Make notification counts properly translatable

Summary:
Ref T9132. When I've touched PhabricatorApplication I keep hitting this bad pht() junk.

The warning is correct, these strings are not extactable and can not be translated.

Fix it so they can be extracted and translated.

Broadly, in all cases we want to render one of these:

95 Things (for fewer than some limit)
99+ Things (when we hit the limit)

Test Plan: Looked at homepage status counts, moused over them, saw reasonable strings. Grepped for removed method.

Reviewers: chad

Reviewed By: chad

Subscribers: joshuaspence

Maniphest Tasks: T9132

Differential Revision: https://secure.phabricator.com/D14638