Translate app/assets/locales/en.json in ja (#5036)

100% translated for the source file 'app/assets/locales/en.json'
on the 'ja' language.

Co-authored-by: transifex-integration[bot] <43880903+transifex-integration[bot]@users.noreply.github.com>

app/assets/locales/ja.json

@@ -172,7 +172,7 @@
     "unpublished": "非公開",
     "protected": "秘匿",
     "length_in_minutes": "{{recording.length}}分",
-    "processing_recording": "録画処理中...",
+    "processing_recording": "録画を処理中。数分かかることがあります...",
     "copy_recording_urls": "録画のURLをコピー",
     "recordings_list_empty": "まだ録画がありません！",
     "recordings_list_empty_description": "会議を開始し録画すれば、録画データが現れます。",