Warning when configuring the Profile completion

I was configuring the details of the Profil completion feature for an institution on a new Mahara with the setting $cfg->productionmode=false.

When I saved the page I got the following warning :

Call stack (most recent first):

    log_message("sprintf(): Too few arguments", 8, true, true, "/var/mahara/htdocs/lib/mahara.php", 1419) at /var/mahara/htdocs/lib/errors.php:489
    error(2, "sprintf(): Too few arguments", "/var/mahara/htdocs/lib/mahara.php", 1419, array(size 3)) at Unknown:0
    sprintf("La barre de progression du remplissage du profil d...") at Unknown:0
    call_user_func_array("sprintf", array(size 1)) at /var/mahara/htdocs/lib/mahara.php:1419
    format_langstring("La barre de progression du remplissage du profil d...", array(size 0), "fr.utf8") at /var/mahara/htdocs/lib/mahara.php:512
    get_string_location("profilecompletenessdesc1", "admin", array(size 0)) at /var/mahara/htdocs/lib/mahara.php:295
    get_string("profilecompletenessdesc1", "admin") at Unknown:0
    call_user_func_array("get_string", array(size 2)) at /var/mahara/htdocs/lib/dwoo/mahara/plugins/function.str.php:32
    Dwoo_Plugin_str(object(Dwoo_Mahara), "profilecompletenessdesc1", "admin", null, null, null, null, null) at /var/www/data/maharadata/dwoo/compile/raw/var/mahara/htdocs/theme/raw/templates/admin/users/progressbar.tpl.d17.php:10
    include("/var/www/data/maharadata/dwoo/compile/raw/var/maha...") at /var/mahara/htdocs/lib/dwoo/dwoo/Dwoo/Core.php:374
    Dwoo_Core->get(object(Dwoo_Template_File), array(size 44)) at /var/mahara/htdocs/lib/dwoo/mahara/Dwoo_Mahara.php:123
    Dwoo_Mahara->fetch("admin/users/progressbar.tpl") at /var/mahara/htdocs/lib/dwoo/mahara/Dwoo_Mahara.php:107
    Dwoo_Mahara->display("admin/users/progressbar.tpl") at /var/mahara/htdocs/admin/users/progressbar.php:244

Mahara last 16.04_STABLE pulled version