Fix some copy and bugs in Ponder

Summary: Fixes T12939. Fixes some feed stories, mailtags, and headers.

Test Plan: Review changes locally by asking how babby is formed.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T12939

Differential Revision: https://secure.phabricator.com/D18285