New translations messages.json (Greek)

src/main/resources/lang/el-GR/messages.json

@@ -290,5 +290,6 @@
   },
   "currency-not-exists": "&cCannot found currency that you want set to, maybe is bad spelling or that currency not available in this world.",
   "currency-set": "&aSuccessfully set shop currency to {0}.",
-  "currency-unset": "&aSuccessfully remove shop currency setup, will use default now."
+  "currency-unset": "&aSuccessfully remove shop currency setup, will use default now.",
+  "currency-not-support": "&cThe economy plugin doesn't support multi-currency feature."
 }