TrinityCore2/sql/old/3.0.9/02479_world.sql

DELETE FROM `trinity_string` WHERE `entry` = 5007;
INSERT INTO `trinity_string` (`entry`, `content_default`, `content_loc1`, `content_loc2`, `content_loc3`, `content_loc4`, `content_loc5`, `content_loc6`, `content_loc7`, `content_loc8`) VALUES (5007, 'You must be in a raid group to enter this instance.', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL);