Remove unused error messages (no release contains them

at the moment, so we can safely do that). Update an error
mesage to make it translateable.

mysql-test/r/log_tables.result

@@ -73,16 +73,16 @@ select * from mysql.slow_log;
 start_time	user_host	query_time	lock_time	rows_sent	rows_examined	db	last_insert_id	insert_id	server_id	sql_text
 TIMESTAMP	USER_HOST	QUERY_TIME	00:00:00	1	0	test	0	0	1	select sleep(2)
 alter table mysql.general_log engine=myisam;
-ERROR HY000: You cannot alter a log table if logging is enabled
+ERROR HY000: You cannot 'ALTER' a log table if logging is enabled
 alter table mysql.slow_log engine=myisam;
-ERROR HY000: You cannot alter a log table if logging is enabled
+ERROR HY000: You cannot 'ALTER' a log table if logging is enabled
 drop table mysql.general_log;
-ERROR HY000: You cannot drop a log table if logging is enabled
+ERROR HY000: You cannot 'DROP' a log table if logging is enabled
 drop table mysql.slow_log;
-ERROR HY000: You cannot drop a log table if logging is enabled
+ERROR HY000: You cannot 'DROP' a log table if logging is enabled
 set global general_log='OFF';
 alter table mysql.slow_log engine=myisam;
-ERROR HY000: You cannot alter a log table if logging is enabled
+ERROR HY000: You cannot 'ALTER' a log table if logging is enabled
 set global slow_query_log='OFF';
 show create table mysql.general_log;
 Table	Create Table

sql/share/errmsg.txt

@@ -5972,12 +5972,6 @@ ER_RBR_NOT_AVAILABLE
 ER_NO_TRIGGERS_ON_SYSTEM_SCHEMA
         eng "Triggers can not be created on system tables"
         ger "Trigger knnen nicht auf Systemtabellen erzeugt werden"
-ER_CANT_ALTER_LOG_TABLE
-        eng "You can't alter a log table if logging is enabled"
-ER_BAD_LOG_ENGINE
-        eng "One can use only CSV and MyISAM engines for the log tables"
-ER_CANT_DROP_LOG_TABLE
-        eng "Cannot drop log table if log is enabled"
 ER_EVENT_RECURSIVITY_FORBIDDEN
         eng "Recursivity of EVENT DDL statements is forbidden when body is present"
 ER_EVENTS_DB_ERROR
@@ -5993,4 +5987,5 @@ ER_WRONG_STRING_LENGTH
 ER_UNSUPORTED_LOG_ENGINE
         eng "This storage engine cannot be used for log tables""
 ER_BAD_LOG_STATEMENT
-        eng "You cannot %s a log table if logging is enabled"
+        eng "You cannot '%s' a log table if logging is enabled"
+

sql/sql_table.cc

@@ -1628,7 +1628,7 @@ int mysql_rm_table_part2(THD *thd, TABLE_LIST *tables, bool if_exists,
          (!my_strcasecmp(system_charset_info, table->table_name, "slow_log")
           && opt_slow_log && logger.is_slow_log_table_enabled())))
     {
-      my_error(ER_BAD_LOG_STATEMENT, MYF(0), "drop");
+      my_error(ER_BAD_LOG_STATEMENT, MYF(0), "DROP");
       DBUG_RETURN(1);
     }
   }
@@ -5179,7 +5179,7 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
        (table_kind == SLOW_LOG && opt_slow_log &&
          logger.is_slow_log_table_enabled()))
     {
-      my_error(ER_BAD_LOG_STATEMENT, MYF(0), "alter");
+      my_error(ER_BAD_LOG_STATEMENT, MYF(0), "ALTER");
       DBUG_RETURN(TRUE);
     }