Change wording on the team_detail status page.

This is a small change to the wording for a user's status when they join or are rejected from a team. The current wording says "You are a applied for Talk Reviewers" and, after the pull request, it will say "Your status is applied for Talk Reviewers." It's not perfect but I think it's an improvement. The tough thing is that statuses have different grammatical tenses in a sense so it's hard to find a perfect fit for all of them.