MDEV-19262 Server error message is unclear if event is created and event_scheduler = DISABLED

Change error message.

Author: vaintroub

mysql-test/r/events_restart.result

@@ -20,25 +20,25 @@ select @@event_scheduler;
 @@event_scheduler
 OFF
 show events;
-ERROR HY000: Cannot proceed because system tables used by Event Scheduler were found damaged at server start
+ERROR HY000: Cannot proceed, because event scheduler is disabled
 select event_name from information_schema.events;
-ERROR HY000: Cannot proceed because system tables used by Event Scheduler were found damaged at server start
+ERROR HY000: Cannot proceed, because event scheduler is disabled
 show create event intact_check;
-ERROR HY000: Cannot proceed because system tables used by Event Scheduler were found damaged at server start
+ERROR HY000: Cannot proceed, because event scheduler is disabled
 drop event no_such_event;
-ERROR HY000: Cannot proceed because system tables used by Event Scheduler were found damaged at server start
+ERROR HY000: Cannot proceed, because event scheduler is disabled
 create event intact_check_1 on schedule every 5 hour do select 5;
-ERROR HY000: Cannot proceed because system tables used by Event Scheduler were found damaged at server start
+ERROR HY000: Cannot proceed, because event scheduler is disabled
 alter event intact_check_1 on schedule every 8 hour do select 8;
-ERROR HY000: Cannot proceed because system tables used by Event Scheduler were found damaged at server start
+ERROR HY000: Cannot proceed, because event scheduler is disabled
 alter event intact_check_1 rename to intact_check_2;
-ERROR HY000: Cannot proceed because system tables used by Event Scheduler were found damaged at server start
+ERROR HY000: Cannot proceed, because event scheduler is disabled
 drop event intact_check_1;
-ERROR HY000: Cannot proceed because system tables used by Event Scheduler were found damaged at server start
+ERROR HY000: Cannot proceed, because event scheduler is disabled
 drop event intact_check_2;
-ERROR HY000: Cannot proceed because system tables used by Event Scheduler were found damaged at server start
+ERROR HY000: Cannot proceed, because event scheduler is disabled
 drop event intact_check;
-ERROR HY000: Cannot proceed because system tables used by Event Scheduler were found damaged at server start
+ERROR HY000: Cannot proceed, because event scheduler is disabled
 set global event_scheduler=on;
 ERROR HY000: Event Scheduler: An error occurred when initializing system tables. Disabling the Event Scheduler.
 set global event_scheduler=off;

sql/share/errmsg-utf8.txt

@@ -5972,8 +5972,8 @@ ER_EVENT_RECURSION_FORBIDDEN
         eng "Recursion of EVENT DDL statements is forbidden when body is present"
         ger "Rekursivität von EVENT-DDL-Anweisungen ist unzulässig wenn ein Hauptteil (Body) existiert"
 ER_EVENTS_DB_ERROR
-        eng "Cannot proceed because system tables used by Event Scheduler were found damaged at server start"
-        ger "Kann nicht weitermachen, weil die Tabellen, die von Events verwendet werden, beim Serverstart als beschädigt markiert wurden"
+        eng "Cannot proceed, because event scheduler is disabled"
+        ger "Die Operation kann nicht fortgesetzt werden, da Event Scheduler deaktiviert ist."
 ER_ONLY_INTEGERS_ALLOWED
         eng "Only integers allowed as number here"
         ger "An dieser Stelle sind nur Ganzzahlen zulässig"