Bug 35057: Improve tag description labels in biblio and authority framework editing

Bug 35057: Improve tag description labels in biblio and authority framework editing

This patch updates several templates in order to clarify labels in forms
and on table columns.

To test apply the patch and go to Administration -> Authority types ->
MARC structure.

- The second column should now be labeled "Tag description."
- Click "Edit" on one of the tags.
- The description fields should now be labeled "Description in staff
  interface" and "Description in OPAC."
- Return to the list of tags and choose Actions -> Subfields for one of
  the tags. The second column should read "Description."
  - Click "Edit" on one of the subfields.
    - The description fields should now be labeled "Description in staff
      interface" and "Description in OPAC."

Go to Administration -> MARC bibliographic framework -> MARC structure.

- The second column should now be labeled "Tag description."
- Click "Edit" on one of the tags.
- The description fields should now be labeled "Description in staff
  interface" and "Description in OPAC."
- Return to the list of tags and choose Actions -> Subfields for one of
  the tags. The second column should read "Description."
  - Click "Edit" on one of the subfields.
    - The description fields should now be labeled "Description in staff
      interface" and "Description in OPAC."

Signed-off-by: Barbara Johnson <barbara.johnson@bedfordtx.gov>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>