"buddy" not translated when congratulating user on new buddy

Here are the steps to reproduce this bug:

1. Make sure that you're configured so that buddy requests require approval.
2. Modify the buddylist_translation function in buddylist.module so that the translation for "@buddy" and "@Buddy" is "contact".
3. As UserA, ask UserB to be your buddy.
4. As UserB, approve UserA's request.
5. Note that the message "Congratulations! UserA is now your buddy." appears. It should read, "Congratulations! plainuser is now your contact." instead.

The very minor attached patch (I just added a missing "@" sign in front of "buddy" in line 972 on the HEAD branch) corrects this problem.