New translations en.json (Chinese Simplified)

[ci skip]

packages/i18n/strings/zh.json

@@ -433,6 +433,9 @@
           "model": {
             "name": "模型"
           },
+          "skins": {
+            "unreleased": "Unreleased"
+          },
           "dynamic": {
             "name": "动态装甲",
             "custom_shell": {