Add German translation

src/locales/zh_Hans.json

@@ -9,7 +9,8 @@
         "Spanish": "西班牙语",
         "Russian": "俄语",
         "Vietnamese": "越南语",
-        "Simplified Chinese": "简体中文"
+        "Simplified Chinese": "简体中文",
+        "German": "德语"
     },
     "default": {
         "currency": "CNY",
@@ -1922,4 +1923,4 @@
     "Parameter Invalid": "参数错误",
     "Numeric Overflow": "数值溢出",
     "Click to close": "点击关闭"
-}
+}