Use "Folder", not "Directory", in file browser settings

[JasonWeill]

Problem

Although directory is used in command names, our UI uses folder in the file browser:

(Note that the above command is "create-new-directory", thanks @andrii-i for the screenshot)

Two settings in the advanced settings editor, "Navigate to current directory" and "Filter directories", use directory, not folder.

Proposed Solution

Use folder consistently in the user interface. Renaming commands is not necessary.

Additional context

• Microsoft's style guide on folder: https://learn.microsoft.com/en-us/style-guide/a-z-word-list-term-collections/f/folder-folder-icon
• macOS tends to favor folder in the user interface, except when explicitly referring to the structure of a file system.

[Rob-P-Smith]

I am done with the change requested and verified desired behavior.

I can't submit a pull request yet as it's not assigned/traiged etc.

[JasonWeill]

@Rob-P-Smith Thank you so much for your interest! Please feel free to open a pull request when you're ready.

[krassowski]

Closing as fixed by https://github.com/jupyterlab/jupyterlab/pull/16234.