Add text area for notes while correcting

[lfoppiano]

As suggested by @ChikakoSakai, would be useful to have an area where the curator can add some additional information in the correction form:

[lfoppiano]

Open question: where do we store it?

[t29mato]

Should I add the note field to the Record class in schemas.py?

[lfoppiano]

@t29mato we postpone this for later if requested the fix is quick but might require some rearrangement of the dialog