nuxeo-signature-1.1.1 localization problem

Using latest public 572 (nuxeo-cap-5.7.2-I20130730_1006-tomcat)
From AdminCenter/Update, I installed the Digital-Signature plugin, which name is nuxeo-signature-1.1.1
After restart, all works as expected (ca sign document) but the labels, which are not localized (see screenshots), so for example, the tilte of the tab (in "Home") is "label.cert.user.center.certificate".
Same issue in 571.
Works ok in 56, correct localized labels displayed.