Bug 32198: Add page-section to stock rotation stages list (cat)

Bug 32198: Add page-section to stock rotation stages list (cat)

This patch adds a .page-section container around relevant areas of the
stock rotation management interface.

Also changed: Removed a .dialog.message container which was not correct.

To test, apply the patch and go to Cataloging -> Stock rotation.

- If necessary, add a rota.
- Click Manage -> Stages on your rota.
  - If neccesary, create one or more stages.
  - The display of stages should look correct.
- From the list of rotas click Manage -> Items.
  - Click "Add items" and use a barcode file to add multiple items at
    once.
  - The page confirming your submission, with a list of items, should
    have a page-section.
  - Return to the view of items in the rota. The display of items should
    look correct.

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