Bug 27775: Add hint about drag and drop feature on framework subfield edit

Bug 8976 introduced a way to sort subfields on a MARC/Auth framework using drag and drop. But there's no visible hint alerting the user the feature exists.

Test plan :
1) Go to Admistration > MARC bibliographic framework
2) Choose a framework and click on Actions > MARC structure
3) Choose a field and click on Actions > Edit subfields
4) Check you see the hint
5) Go to Admistration > Authority types
6) Choose a type and click on Actions > MARC structure
7) Choose a field and click on Actions > Subfields
8) Click on Edit subfields
9) Check you see the hint

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

koha-tmpl/intranet-tmpl/prog/en/modules/admin/auth_subfields_structure.tt

@@ -85,6 +85,7 @@
     <h1>[% IF ( use_heading_flags_p ) %]
     [% IF ( heading_edit_subfields_p ) %]Edit MARC subfields constraints for field [% tagfield | html %] authority [% authtypecode | html %][% END %]
     [% ELSE %][% action | html %][% END %]</h1>
+    <div class="hint">You can drag and drop subfields tabs to change the order</div>
     <form action="[% script_name | html %]" name="Aform" method="post">
         <input type="hidden" name="op" value="add_validate" />
         <input type="hidden" name="tagfield" value="[% tagfield | html %]" />

koha-tmpl/intranet-tmpl/prog/en/modules/admin/marc_subfields_structure.tt

@@ -121,6 +121,7 @@
                                 [% action | html %]
                             [% END %]
                         </h1>
+                        <div class="hint">You can drag and drop subfields tabs to change the order</div>
 
                         <form action="[% script_name | html %]" name="Aform" method="post">
                             <input type="hidden" name="op" value="add_validate" />