Hi Philippe,
You can do language override for those language string below:
[gist type="php"]
COM_EASYSOCIAL_STREAM_APP_FILTER_APPS="Applications"
COM_EASYSOCIAL_STREAM_APP_FILTER_ARTICLE="Articles"
COM_EASYSOCIAL_STREAM_APP_FILTER_AUDIOS="Audio"
COM_EASYSOCIAL_STREAM_APP_FILTER_BADGES="Achievements"
COM_EASYSOCIAL_STREAM_APP_FILTER_BLOG="Blog"
COM_EASYSOCIAL_STREAM_APP_FILTER_BROADCAST="Broadcasts"
COM_EASYSOCIAL_STREAM_APP_FILTER_CALENDAR="Calendar"
COM_EASYSOCIAL_STREAM_APP_FILTER_DISCUSS="Discussions"
COM_EASYSOCIAL_STREAM_APP_FILTER_DISCUSSIONS="Discussions"
COM_EASYSOCIAL_STREAM_APP_FILTER_EVENTS="Events"
COM_EASYSOCIAL_STREAM_APP_FILTER_FEEDS="Feeds"
COM_EASYSOCIAL_STREAM_APP_FILTER_FILES="Files"
COM_EASYSOCIAL_STREAM_APP_FILTER_FOLLOWERS="Followers"
COM_EASYSOCIAL_STREAM_APP_FILTER_FORUM_UPDATES="Forums"
COM_EASYSOCIAL_STREAM_APP_FILTER_FRIENDS="Friends"
COM_EASYSOCIAL_STREAM_APP_FILTER_GROUPS="Groups"
COM_EASYSOCIAL_STREAM_APP_FILTER_GUESTS="Attendance"
COM_EASYSOCIAL_STREAM_APP_FILTER_KOMENTO="Comments"
COM_EASYSOCIAL_STREAM_APP_FILTER_KUNENA="Forums"
COM_EASYSOCIAL_STREAM_APP_FILTER_KUNENA_FORUM="Forums"
COM_EASYSOCIAL_STREAM_APP_FILTER_LINKS="Links"
COM_EASYSOCIAL_STREAM_APP_FILTER_NEWS="Announcements"
COM_EASYSOCIAL_STREAM_APP_FILTER_NOTES="Notes"
COM_EASYSOCIAL_STREAM_APP_FILTER_PAGES="Pages"
COM_EASYSOCIAL_STREAM_APP_FILTER_PHOTOS="Photos"
COM_EASYSOCIAL_STREAM_APP_FILTER_POLLS="Polls"
COM_EASYSOCIAL_STREAM_APP_FILTER_PROFILES="Profile Updates"
COM_EASYSOCIAL_STREAM_APP_FILTER_PROFILE_UNLOCKER="Profile Unlocker"
COM_EASYSOCIAL_STREAM_APP_FILTER_PSN="PlayStation Network"
COM_EASYSOCIAL_STREAM_APP_FILTER_RELATIONSHIP="Relationship"
COM_EASYSOCIAL_STREAM_APP_FILTER_SHARES="Repost"
COM_EASYSOCIAL_STREAM_APP_FILTER_STORY="Updates"
COM_EASYSOCIAL_STREAM_APP_FILTER_TASKS="Tasks"
COM_EASYSOCIAL_STREAM_APP_FILTER_TEXT="Text"
COM_EASYSOCIAL_STREAM_APP_FILTER_USERS="Sign-ins"
COM_EASYSOCIAL_STREAM_APP_FILTER_USER_NOTES="Notes"
COM_EASYSOCIAL_STREAM_APP_FILTER_VIDEOS="Videos"
[/gist]
Example:
1. Click extensions>language(s)>overrides>new
Language constant: COM_EASYSOCIAL_STREAM_APP_FILTER_APPS
and add the text as you prefer
http://take.ms/zPmZD