BC-11470 - Add backup banner in DBC (#1378)

Author: cdarsow

ansible/group_vars/dbc/instance_cfg.yml

@@ -5,7 +5,7 @@ SC_TITLE: dBildungscloud
 SC_PRODUCTNAME: dBildungscloud
 SC_NAV_TITLE: dBildungscloud
 SC_CONTACT_EMAIL: ticketsystem@dbildungscloud.de
-GLOBAL_ANNOUNCEMENT_TEXT: ""
+GLOBAL_ANNOUNCEMENT_TEXT: loggedin.text.backupFeatures
 GLOBAL_ANNOUNCEMENT_ROLES: teacher,administrator
 
 TEACHER_VISIBILITY_FOR_EXTERNAL_TEAM_INVITATION: opt-in