diff --git a/admin/roles/assign.php b/admin/roles/assign.php
index 435b1a818c1..9c07e200591 100755
--- a/admin/roles/assign.php
+++ b/admin/roles/assign.php
@@ -34,7 +34,8 @@
     }
 
     if (! $context = get_context_instance_by_id($contextid)) {
-        print_error("Context ID was incorrect (can't find it)");
+        print_error('wrongcontextid', 'error');
+        
     }
 
     $inmeta = 0;
@@ -43,13 +44,13 @@
         if ($course = get_record('course', 'id', $courseid)) {
             $inmeta = $course->metacourse;
         } else {
-            print_error('Invalid course id');
+            print_error('invalidcourse', 'error');
         }
         $coursecontext = $context;
 
     } else if (!empty($courseid)){ // we need this for user tabs in user context
         if (!$course = get_record('course', 'id', $courseid)) {
-            print_error('Invalid course id');
+            print_error('invalidcourse', 'error');
         }
         $coursecontext = get_context_instance(CONTEXT_COURSE, $course->id);
 
diff --git a/admin/roles/manage.php b/admin/roles/manage.php
index 727ca64baa9..1d2b94b9ea7 100755
--- a/admin/roles/manage.php
+++ b/admin/roles/manage.php
@@ -222,7 +222,7 @@
                     $role->description = $description;
 
                     if (!update_record('role', $role)) {
-                        print_error('Could not update role!');
+                        print_error('cannotupdaterole', 'error');
                     }
 
                     // set proper legacy type
@@ -249,7 +249,7 @@
 
         case 'delete':
             if (in_array($roleid, $defaultroles)) {
-                print_error('This role is used as one of the default system roles, it can not be deleted');
+                print_error('cannotdeleterole', 'error', '', 'this role is used as one of the default system roles, it can not be deleted');
             }
             if ($confirm and data_submitted() and confirm_sesskey()) {
                 if (!delete_role($roleid)) {
@@ -257,7 +257,7 @@
                     // partially deleted a role sitewide...?
                     mark_context_dirty($sitecontext->path);
 
-                    print_error('Could not delete role with ID '.$roleid);
+                    print_error('cannotdeleterolewithid', 'error', '', $roleid);
                 }
                 // deleted a role sitewide...
                 mark_context_dirty($sitecontext->path);
@@ -286,7 +286,7 @@
                     $above = $roles[$rolesort[$role->sortorder - 1]];
 
                     if (!switch_roles($role, $above)) {
-                        print_error("Cannot move role with ID $roleid");
+                        print_error('cannotmoverolewithid', 'error', '', $roleid);
                     }
                 }
             }
@@ -301,7 +301,7 @@
                     $below = $roles[$rolesort[$role->sortorder + 1]];
 
                     if (!switch_roles($role, $below)) {
-                        print_error("Cannot move role with ID $roleid");
+                        print_error('cannotmoverolewithid', 'error', '', $roleid);
                     }
                 }
             }
@@ -436,7 +436,7 @@
                 $role = stripslashes_safe($newrole);
         } else {
             if(!$role = get_record('role', 'id', $roleid)) {
-                print_error('Incorrect role ID!');
+                print_error('wrongroleid', 'error');
             }
             $role->legacytype = get_legacy_type($role->id);
         }
diff --git a/admin/roles/override.php b/admin/roles/override.php
index a49409ad774..5b612b445ff 100755
--- a/admin/roles/override.php
+++ b/admin/roles/override.php
@@ -9,24 +9,24 @@
     $cancel    = optional_param('cancel', 0, PARAM_BOOL);
 
     if (!$context = get_record('context', 'id', $contextid)) {
-        print_error('Bad context ID');
+        print_error('wrongcontextid', 'error');
     }
 
     if (!$sitecontext = get_context_instance(CONTEXT_SYSTEM)) {
-        print_error('No site ID');
+        print_error('nositeid', 'error');
     }
 
     if ($context->id == $sitecontext->id) {
-        print_error('Can not override base role capabilities');
+        print_error('cannotoverridebaserole', 'error');
     }
 
     if (!has_capability('moodle/role:override', $context)) {
-        print_error('You do not have permission to change overrides in this context!');
+        print_error('nopermissions', 'error', '', 'change overrides in this context!');
     }
 
     if ($courseid) {
         if (!$course = get_record('course', 'id', $courseid)) {
-            print_error('Bad course ID');
+            print_error('invalidcourse');
         }
 
         $coursecontext = get_context_instance(CONTEXT_COURSE, $course->id);
diff --git a/admin/roles/tabs.php b/admin/roles/tabs.php
index e19b81c704c..7b17019d48c 100755
--- a/admin/roles/tabs.php
+++ b/admin/roles/tabs.php
@@ -61,16 +61,16 @@ if ($currenttab != 'update') {
         case CONTEXT_MODULE:
             // get module type?
             if (!$cm = get_record('course_modules','id',$context->instanceid)) {
-                print_error('Bad course module ID');
+                print_error('invalidcoursemodule', 'error');
             }
             if (!$module = get_record('modules','id',$cm->module)) {  //$module->name;
-                print_error('Bad module ID');
+                print_error('invalidmodule', 'error');
             }
             if (!$course = get_record('course','id',$cm->course)) {
-                print_error('Bad course ID');
+                print_error('invalidcourse');
             }
             if (!$instance = get_record($module->name, 'id', $cm->instance)) {
-                print_error("The required instance of this module doesn't exist");
+                print_error('moduledoesnotexist', 'error');
             }
 
             require_login($course);