Welcome to the community forums. I double checked the French translation file for the toolbar and the string is translated. I also looked around on my own installation which is in Dutch, and the string is also translated, but like you report the English text is showing. So, looks like a bug (unless we both overlook an ini setting? anyone welcome for comments) which you might want to report on http://issues.ez.no.
Regards Robin
Board member, eZ Publish Community Project Board - Member of the share.ez.no team - Key values: Openness and Innovation.