Add bubble to user menu for pending users.

Courtesy of https://wordpress.org/support/profile/howdy_mcgee

https://wordpress.org/support/topic/get-number-of-pending-users#post-5920371
Comment user bubble feature.
Make it possible to translate status column.
Make sure user is set before using it.
Tested with WordPress 4.1
Merge branch 'feature/translate-status-column' into develop
Add to readme for translation bug.
Merge branch 'feature/user-pending-bubble' into develop
Add pending user feature to readme.
Format the new changes.
Bump the version number to 1.7.2
Update translation files.
Merge branch 'release/1.7.2'