[ja] sync translated content (#20367)

* ja: sync translated content

* Update _redirects.txt

* Update _wikihistory.json

* Delete files/ja/conflicting/glossary/cors-safelisted_request_header/index.md

* Delete files/ja/conflicting/glossary/cors-safelisted_response_header/index.md

---------

Co-authored-by: Masahiro FUJIMOTO <[email protected]>

Author: mdn-bot

files/ja/_redirects.txt

@@ -1349,6 +1349,8 @@
 /ja/docs/Glossary/Scrollport	/ja/docs/Glossary/Scroll_container
 /ja/docs/Glossary/Signature/セキュリティ	/ja/docs/Glossary/Signature/Security
 /ja/docs/Glossary/Signature/関数	/ja/docs/Glossary/Signature/Function
+/ja/docs/Glossary/Simple_header	/ja/docs/Glossary/CORS-safelisted_request_header
+/ja/docs/Glossary/Simple_response_header	/ja/docs/Glossary/CORS-safelisted_response_header
 /ja/docs/Glossary/Symbol	/ja/docs/Web/JavaScript/Reference/Global_Objects/Symbol
 /ja/docs/Glossary/Transferable_objects	/ja/docs/Web/API/Web_Workers_API/Transferable_objects
 /ja/docs/Glossary/XHR_(XMLHttpRequest)	/ja/docs/Glossary/XMLHttpRequest

files/ja/_wikihistory.json

@@ -1757,14 +1757,6 @@
     "modified": "2020-03-30T14:20:00.023Z",
     "contributors": ["Uemmra3", "Marsf", "MaxfieldWalker"]
   },
-  "Glossary/Simple_header": {
-    "modified": "2020-08-11T15:13:18.407Z",
-    "contributors": ["mfuji09"]
-  },
-  "Glossary/Simple_response_header": {
-    "modified": "2019-08-11T03:51:18.097Z",
-    "contributors": ["mfuji09", "silverskyvicto"]
-  },
   "Glossary/Site": {
     "modified": "2020-04-12T14:25:01.758Z",
     "contributors": ["mfuji09"]