Standerdizing currency symbols Part 2 (#94259)

## About The Pull Request
Converts almost all non-constant, non-tgui usages of all variantions of
"credit" and "cr"

Everything seems in order, tested most the currencies.
<img width="905" height="119" alt="image"
src="https://github.com/user-attachments/assets/3fa005a7-a114-426c-9646-b81f68bc2dec"
/>
<img width="255" height="128" alt="image"
src="https://github.com/user-attachments/assets/14c83b54-4fd9-4bee-838f-5b1c03939d9a"
/>


## Why It's Good For The Game
Same justification as https://github.com/tgstation/tgstation/pull/94128
Just easier to mantain/adjust the grammer/names of our money
## Changelog
🆑
spellcheck: minor cleanup on some usecases of "credits"
/🆑

code/game/objects/structures/displaycase.dm

@@ -563,7 +563,7 @@
 				if(payments_acc)
 					payments_acc.adjust_money(sale_price, "Display Case: [capitalize(showpiece.name)]")
 				usr.put_in_hands(showpiece)
-				to_chat(usr, span_notice("You purchase [showpiece] for [sale_price] credits."))
+				to_chat(usr, span_notice("You purchase [showpiece] for [sale_price] [MONEY_NAME]."))
 				playsound(src, 'sound/effects/cashregister.ogg', 40, TRUE)
 				flick("[initial(icon_state)]_vend", src)
 				showpiece = null
@@ -666,7 +666,7 @@
 /obj/structure/displaycase/forsale/examine(mob/user)
 	. = ..()
 	if(showpiece && !open)
-		. += span_notice("[showpiece] is for sale for [sale_price] credits.")
+		. += span_notice("[showpiece] is for sale for [sale_price] [MONEY_NAME].")
 	if(broken)
 		. += span_notice("[src] is sparking and the hover field generator seems to be overloaded. Use a multitool to fix it.")