Fixes wording on CannotRemoveNegativeItems (#5901)

Essentials/src/main/resources/messages.properties

@@ -118,7 +118,7 @@ burnMsg=<primary>You set<secondary> {0} <primary>on fire for<secondary> {1} seco
 cannotSellNamedItem=<primary>You are not allowed to sell named items.
 cannotSellTheseNamedItems=<primary>You are not allowed to sell these named items\: <dark_red>{0}
 cannotStackMob=<dark_red>You do not have permission to stack multiple mobs.
-cannotRemoveNegativeItems=<dark_red>You can not remove negative items.
+cannotRemoveNegativeItems=<dark_red>You cannot remove a negative amount of items.
 canTalkAgain=<primary>You can now talk again.
 cantFindGeoIpDB=Can''t find GeoIP database\!
 cantGamemode=<dark_red>You do not have permission to change to gamemode {0}