Hey Jan,

Are you referring to these items, http://take.ms/bilcB ? These are located in /language/en-GB/en-GB.com_easysocial with the following strings,

[gist]
COM_EASYSOCIAL_TOOLBAR_PROFILE_VIEW_YOUR_PROFILE="My Profile"
COM_EASYSOCIAL_TOOLBAR_INVITE_FRIENDS="Invite Friends"
COM_EASYSOCIAL_TOOLBAR_PROFILE_ACHIEVEMENTS="Achievements"
COM_EASYSOCIAL_TOOLBAR_PROFILE_POINTS_HISTORY="Points"
COM_EASYSOCIAL_TOOLBAR_PROFILE_CONVERSATIONS="Conversations"
[/gist]

Just for your information, if you want to find for the language constant, you could open up the file /components/com_easysocial/themes/wireframe/toolbar/default.php and search for the constant