Make the _get_profile_stats() output markup more consistent and translator-friendly

- Apply <strong> tag in both plural and singular forms
- Don't include <strong> tag in gettext string

Fixes #5383

Props danbp

git-svn-id: https://buddypress.svn.wordpress.org/trunk@7828 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Tabs not spaces

git-svn-id: https://buddypress.svn.wordpress.org/trunk@7829 cdf35c40-ae34-48e0-9cc9-0c9da1808c22