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/game/objects/items/charter.dm

@@ -125,7 +125,7 @@
 
 
 /obj/item/station_charter/flag
-	name = "nanotrasen banner"
+	name = "GATO banner"
 	icon = 'icons/obj/items_and_weapons.dmi'
 	name_type = "planet"
 	icon_state = "banner"
@@ -141,7 +141,7 @@
 	minor_announce("[ureal_name] has designated the planet as [station_name()]", "Captain's Banner", 0)
 	log_game("[ukey] has renamed the planet as [station_name()].")
 	name = "banner of [station_name()]"
-	desc = "The banner bears the official coat of arms of Nanotrasen, signifying that [station_name()] has been claimed by Captain [uname] in the name of the company."
+	desc = "The banner bears the official coat of arms of GATO, signifying that [station_name()] has been claimed by Captain [uname] in the name of the company."
 	SSblackbox.record_feedback("text", "station_renames", 1, "[station_name()]")
 	if(!unlimited_uses)
 		used = TRUE