Index: openacs-4/packages/acs-subsite/tcl/group-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-subsite/tcl/group-procs.tcl,v
diff -u -r1.39.2.15 -r1.39.2.16
--- openacs-4/packages/acs-subsite/tcl/group-procs.tcl	12 May 2017 16:17:44 -0000	1.39.2.15
+++ openacs-4/packages/acs-subsite/tcl/group-procs.tcl	19 May 2017 16:25:00 -0000	1.39.2.16
@@ -129,7 +129,7 @@
     # In case, a pretty_name was already provided in form of a message
     # key, there is no need to convert this a second time.
 
-    if {![regexp [lang::util::message_tag_regexp] $pretty_name]} {
+    if {![regexp [lang::util::message_key_regexp] $pretty_name]} {
 	set pretty_name [lang::util::convert_to_i18n -message_key "group_title_${group_id}" -text "$pretty_name"]
     }