nanotrasen to gato

Replaced most instances of Nanotrasen mentions into GATO, though I've kept some that have more sense to be kept as Nanotrasen (like nanotrasen marked stuff and such)

code/modules/events/supernova.dm

@@ -35,7 +35,7 @@
 /datum/round_event/supernova/announce()
 	var/message = "[station_name()]: Our tachyon-doppler array has detected a supernova in your vicinity. Peak flux from the supernova estimated to be [round(power,0.1)] times current solar flux; if the supernova is close to your sun in the sky, your solars may receive this as a power boost.[power > 1 ? " Short burts of radiation may be possible, so please prepare accordingly." : "We expect no radiation bursts from this one."] We hope you enjoy the light."
 	if(prob(power * 25))
-		priority_announce(message, sender_override = "Nanotrasen Meteorology Division", has_important_message = TRUE)
+		priority_announce(message, sender_override = "GATO Meteorology Division", has_important_message = TRUE)
 		announced = TRUE
 	else
 		print_command_report(message)
@@ -69,7 +69,7 @@
 	qdel(supernova)
 	if(announced)
 		priority_announce("The supernova's flux is now negligible. Radiation storms have ceased. Have a pleasant shift, [station_name()], and thank you for bearing with nature.",
-		sender_override = "Nanotrasen Meteorology Division")
+		sender_override = "GATO Meteorology Division")
 
 /datum/weather/rad_storm/supernova
 	weather_duration_lower = 50