Bug 31876: Fix capitalization "Click to Expand Tag"

Bug 31876: Fix capitalization "Click to Expand Tag"

The string "Click to Expand this Tag" appears in addbiblio.tt a couple of times. It should be "Click to expand this tag".

To get to the string for the staff interface:
1. In the staff interface, go to Cataloging
2. Click "New record"
3. Hover the mouse cursor over one of the tag titles (e.g. CONTROL NUMBER)
   --> a little popup thing (tooltip?) appears with "Click to Expand this Tag"
4. Go to Administration > Global system preferences
5. Search for advancedMARCeditor
6. Change the value to "Don't show"
7. Click "Save all Cataloging preferences"
8. Go back to Cataloging > New record
9. Hover the mouse cursor over the tag number (e.g. 001)
   --> a little popup thing (tooltip?) appears with "<tag title> Click to Expand this Tag"
10. Go to Authorities > new record
11. Hover over the desription of a tag which subfields are collapsed
   --> verify the tooltip appears with "Click to Expand this Tag"
12. Apply patch, all occurrences should be fixed now.

Signed-off-by: Caroline Cyr La Rose <caroline.cyr-la-rose@inlibro.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>