If you install the Translation manager and filter and go to Site Administration > Language > Update content a page appears saying 'Content translation manager' and with fields for:

• Old text (showing an Atto editor field)
• New text (showing an Atto editor field)
• Old text plain (showing a plain text field)
• New text plain (showing a plain text field)

With Save changes and Cancel buttons at the bottom.

What are these for? If they aren't required can we delete them from the Site Admin menu?