[MIRROR] Refactors roundstart centcom threat report. (#2739)

* Refactors roundstart centcom threat report.

* Update blob.dm

* Update changeling.dm

* Update traitor_chan.dm

* Update sandbox.dm

* Update traitor.dm

code/game/gamemodes/extended/extended.dm

@@ -1,6 +1,7 @@
 /datum/game_mode/extended
 	name = "secret extended"
 	config_tag = "secret_extended"
+	false_report_weight = 5
 	required_players = 0
 
 	announce_span = "notice"
@@ -12,9 +13,13 @@
 /datum/game_mode/extended/post_setup()
 	..()
 
+/datum/game_mode/extended/generate_report()
+	return "The transmission mostly failed to mention your sector. It is possible that there is nothing in the Syndicate that could threaten your station during this shift."
+
 /datum/game_mode/extended/announced
 	name = "extended"
 	config_tag = "extended"
+	false_report_weight = 0
 
 /datum/game_mode/extended/announced/generate_station_goals()
 	for(var/T in subtypesof(/datum/station_goal))