All GJ language strings are in GJs language files. The defaults can be found below.
components/com_comprofiler/plugin/user/plug_cbgroupjive/language/default_language/
They should not be modified at the above location though, but instead translated in your CB language files as needed. You can find information on language string usage in the CB 2.0 Primer Book and at the below location.
www.joomlapolis.com/cb-solutions/languages
For example Users is as follows.
Code:
'GROUP_USERS' => 'Users',
The counter is as follows.
Code:
'GROUP_USERS_COUNT' => '%%COUNT%% User|%%COUNT%% Users',