Frontend corrections

[nolan1999]

1. Correct job details tree

• Prettify names, e.g. date_created => Date created.

2. Correct file view

• Await on folder creation to avoid error when opening it too fast after creation.
• Bug: if a folder is renamed without the trailing "/" (e.g. Files/ -> Files_new), it is transformed to a file. Instead, the frontend should add the implicit "/" if missing.
• Clicking on menu item "Files" should go back to the data root (i.e., reload the page). The same should be true for the "Jobs" menu.
• Bug: when reloading the page while on the "File"/"Job"/ menu items, the login page is opened (although the user is still authenticated). Instead, the normal page should be loaded if the user is already logged in, as happens for "Home".

3. Correct job submission

• Bug: if setting env=any after changing it to something else, an error is raised on job submission: "Error(s) in job definition: - environment: value is not a valid enumeration member; permitted: 'cloud', 'local', None".
• Only allow selecting directories for config/data, not single files.