Bug 33855: Clean up forms and page sections on 'manage MARC imports' page

Bug 33855: Clean up forms and page sections on 'manage MARC imports' page

This patch makes minor changes to the structure of the "Manage MARC
imports" page so that sections are more clearly delineated and forms
have the correct structure.

The patch also shortens the new framework field labels and adds hints
for clarification.

To test, apply the patch and go to Cataloging -> Stage MARC records for
import.

- Import a batch of MARC records.
- Go to Cataloging -> Manage staged records.
- View the batch you just imported.
- You should see three sections:
  - A list of information about the batch
  - Options for changing the matching rules
  - Options for setting frameworks during import.
- Test that the form for applying different matching rules still works
  correctly.
  - Import a batch of records which contains matches (by, for example,
    exporting MARC records from Koha and then reimporting the same
    batch)
  - On the manage page for that batch try changing the matching rule
    applied, switching between "Do not look for matching records" and a
    matching rule which will catch the duplicate records.
- Test that your records are imported correctly according to the
  framework settings you select, both for new records and for replaced
  records.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>