Bug 42928: Update log viewer action terminology - Return to Check-in

The log viewer results table uses "Return" for "Check-in" actions.

See the terminology list:
https://wiki.koha-community.org/wiki/Terminology#C

Test plan:
1. Check out an item to a patron, then check it back in again.
2. Go to the log view (Tools > Additional tools > Log viewer).
3. Click "Submit".
4. Note that the action column for the results shows "Return".
5. Apply the patch.
6. Refresh the log viewer page.
6. Note that the action column now correctly shows "Check-in".

Signed-off-by: Laura_Escamilla <laura.escamilla@bywatersolutions.com>
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>

koha-tmpl/intranet-tmpl/prog/en/includes/str/viewlog.inc

@@ -35,7 +35,7 @@
         RESTORE: _("Restore"),
         REVOKE: _("Revoke"),
         ISSUE: _("Checkout"),
-        RETURN: _("Return"),
+        RETURN: _("Check-in"),
         CREATE: _("Create"),
         CANCEL: _("Cancel"),
         FILL: _("Fill"),