[ja] sync translated content (#14857)

* ja: sync translated content

* Update _redirects.txt

* Delete index.md

* Update _wikihistory.json

---------

Co-authored-by: Masahiro FUJIMOTO <mfujimot@gmail.com>

files/ja/_redirects.txt

@@ -2764,6 +2764,7 @@
 /ja/docs/Web/API/FileReader/onload	/ja/docs/Web/API/FileReader/load_event
 /ja/docs/Web/API/FileSystemEntrySync	/ja/docs/Web/API/File_and_Directory_Entries_API
 /ja/docs/Web/API/File_Handle_API	/ja/docs/Web/API/File_and_Directory_Entries_API
+/ja/docs/Web/API/File_System_Access_API	/ja/docs/Web/API/File_System_API
 /ja/docs/Web/API/FormDataEntryValue	/ja/docs/conflicting/Web/API/FormData
 /ja/docs/Web/API/Geolocation.clearWatch	/ja/docs/Web/API/Geolocation/clearWatch
 /ja/docs/Web/API/Geolocation.getCurrentPosition	/ja/docs/Web/API/Geolocation/getCurrentPosition
@@ -3130,6 +3131,7 @@
 /ja/docs/Web/API/Web_Video_Text_Tracks_Format	/ja/docs/Web/API/WebVTT_API
 /ja/docs/Web/API/Window.dispatchEvent	/ja/docs/Web/API/EventTarget/dispatchEvent
 /ja/docs/Web/API/Window.onafterprint	/ja/docs/Web/API/Window/afterprint_event
+/ja/docs/Web/API/Window/DOMContentLoaded_event	/ja/docs/Web/API/Document/DOMContentLoaded_event
 /ja/docs/Web/API/Window/URL	/ja/docs/Web/API/URL
 /ja/docs/Web/API/Window/animationcancel_event	/ja/docs/Web/API/Element/animationcancel_event
 /ja/docs/Web/API/Window/animationend_event	/ja/docs/Web/API/Element/animationend_event
@@ -3785,7 +3787,7 @@
 /ja/docs/Web/Compatibility_FAQ/Tips_Vendor_Prefix.html	/ja/docs/orphaned/Web/Compatibility_FAQ/Tips_Vendor_Prefix.html
 /ja/docs/Web/Compatibility_FAQ/Underline_Color_Diffrence.html	/ja/docs/orphaned/Web/Compatibility_FAQ/Underline_Color_Diffrence.html
 /ja/docs/Web/Events/Activate	/ja/docs/Web/API/Element/DOMActivate_event
-/ja/docs/Web/Events/DOMContentLoaded	/ja/docs/Web/API/Window/DOMContentLoaded_event
+/ja/docs/Web/Events/DOMContentLoaded	/ja/docs/Web/API/Document/DOMContentLoaded_event
 /ja/docs/Web/Events/Detecting_device_orientation	/ja/docs/Web/API/Device_orientation_events/Detecting_device_orientation
 /ja/docs/Web/Events/Orientation_and_motion_data_explained	/ja/docs/Web/API/Device_orientation_events/Orientation_and_motion_data_explained
 /ja/docs/Web/Events/abort	/ja/docs/Web/API/HTMLMediaElement/abort_event
@@ -4444,7 +4446,7 @@
 /ja/docs/Web/Reference	/ja/docs/Web
 /ja/docs/Web/Reference/API	/ja/docs/Web/API
 /ja/docs/Web/Reference/Events	/ja/docs/Web/Events
-/ja/docs/Web/Reference/Events/DOMContentLoaded	/ja/docs/Web/API/Window/DOMContentLoaded_event
+/ja/docs/Web/Reference/Events/DOMContentLoaded	/ja/docs/Web/API/Document/DOMContentLoaded_event
 /ja/docs/Web/Reference/Events/audiostart	/ja/docs/Web/API/SpeechRecognition/audiostart_event
 /ja/docs/Web/Reference/Events/beforeunload	/ja/docs/Web/API/Window/beforeunload_event
 /ja/docs/Web/Reference/Events/blur	/ja/docs/Web/API/Element/blur_event

files/ja/_wikihistory.json

@@ -14025,19 +14025,6 @@
       "Hfjapancom"
     ]
   },
-  "Web/API/Window/DOMContentLoaded_event": {
-    "modified": "2020-10-15T21:43:18.027Z",
-    "contributors": [
-      "mfuji09",
-      "wbamberg",
-      "forl-developer",
-      "silverskyvicto",
-      "fscholz",
-      "toris-birds",
-      "hamasaki",
-      "gurezo"
-    ]
-  },
   "Web/API/Window/afterprint_event": {
     "modified": "2020-10-15T22:26:51.266Z",
     "contributors": ["mfuji09"]

files/ja/web/api/file_system_access_api/index.md → files/ja/web/api/file_system_api/index.md

@@ -1,8 +1,7 @@
 ---
 title: File System Access API
-slug: Web/API/File_System_Access_API
-l10n:
-  sourceCommit: adf446b9a3bb1e5f541812f655b00417c3cb44d0
+slug: Web/API/File_System_API
+original_slug: Web/API/File_System_Access_API
 ---
 
 {{securecontext_header}}{{DefaultAPISidebar("File System Access API")}}