Add translation for library/json (#527)

* Add translation for library/json

* Refine sentence in library/json

Author: mindihx

library/json.po

@@ -50,6 +50,8 @@ msgid ""
 "string may cause the decoder to consume considerable CPU and memory "
 "resources. Limiting the size of data to be parsed is recommended."
 msgstr ""
+"當剖析無法信任來源的 JSON 資料時要小心。一段惡意的 JSON 字串可能會導致"
+"解碼器耗費大量 CPU 與記憶體資源。建議限制剖析資料的大小。"
 
 #: ../../library/json.rst:26
 msgid ""