[CB-4625] lower case the w3c reference to avoid match and replace
[CB-4588] updated button labels example code to use array syntax, from deprecated comma separated string syntax
[CB-4588] updated function parameter description to button labels as array of strings
[CB-4644] updated file reader section headings to be more consistent with rest of docs
[CB-4648] corrected error callback parameter names
[CB-4736] documentation for the requestFileSystem function. Also addresses CB-4617
Delete rc versions of docs
[CB-4588] added square brackets to default value documentation
note cameraDirection bug in Android
Update translations from Crowdin.

- Update Spanish, French, and Chinese.
- Add Italian, Japanese, and Korean.
Synchronization with Crowdin

Synchronization with Crowdin

Synchronization with Crowdin

Delete config.json~

Delete config.json~

Delete config.json~

Synchronization with Crowdin

Synchronization with Crowdin

Synchronization with Crowdin

Synchronization with Crowdin

Sync with Crowdin 9/9 code updates
Move Japanese to docs/ja and Korean to docs/ko.