Update zh.json

Author: Blargian

scripts/translate/languages/zh.json

@@ -29,6 +29,7 @@
     "Lightweight Update": "轻量级更新",
     "Nullable": "Nullable",
     "ClickPipes": "ClickPipes",
-    "Kafka": "Kafka"
+    "Kafka": "Kafka",
+    "petabytes": "PB"
   }
 }