Collection issue: small issues and improvements

[fegbert]

Goal

The purpose of this issue is to collect all kinds of issues or improvements I can make before finalizing the app.

Tasks

• Add "edited" state to file list, maybe a revert button?
  • Either add revert button here or "revert all" option to type header
• Add future metadata standards as dropdown but disabled with some "soon" indicator
• Add search bar to fields to easily find specific field to edit
• Add indicator for depricated fields
• Add indicator when using browser that doesn't support file api