Bug 35151: Convert ILLModuleCopyrightClearance system preference to additional contents

Bug 35151: Convert ILLModuleCopyrightClearance system preference to additional contents

This patch moves the ILLModuleCopyrightClearance system preference into
HTML customizations, making it possible to have language- and
library-specific content.

To test you should have some content in the ILLModuleCopyrightClearance
system preference before applying the patch. Apply the patch, run the
database update process, and rebuild the OPAC CSS.

- In the staff client, go to Tools -> HTML customizations and verify
  that the content from ILLModuleCopyrightClearance is now stored there.
- The HTML customization entry form should offer
  ILLModuleCopyrightClearance as a choice under "Display location."
- Update and reinstall active translations (for instance fr-FR):
  - perl misc/translator/translate update fr-FR
  - perl misc/translator/translate install fr-FR
- Enable the translation if necessary under Administration -> System
  preferences -> language.
- Enable the "opaclanguagesdisplay" preference if necessary.
- Edit the ILLModuleCopyrightClearance HTML customization and add unique
  content to the "fr-FR" tab.

- Enable the "ILLModule" and "ILLModuleUnmediated" system preferences if
  necessary. You must have at least one ILL backend installed.
- Log into the OPAC and click the "Interlibrary loan requests" in the
  sidebar menu on the user summary page.
- Click "Create new request."
- You should be taken to a page with your ILLModuleCopyrightClearance
  content shown along with "Yes" and "No" buttons.
  - Clicking "Yes" should take you to the form for creating a new
    request.
- Switch to your updated translation and confirm that the content
  appears correctly.
- Remove all "ILLModuleCopyrightClearance" html customizations. Test the
  "Create new request" process in the OPAC again.
  - There should be no confirmation step before arriving at the form for
    creating a new ILL request.
- Go to Administration -> System preferences and search for
  "ILLModuleCopyrightClearance." It should return no results.

Signed-off-by: Pedro Amorim <pedro.amorim@ptfs-europe.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>