Bug 30993: Improve translatabilty of UPLOAD av hint

Improve translatability on the hint for AV UPLOAD
on the upload tool page.

To test:
* Go to tools > uploads
* Verify that the hint below the 'Browse...' displayes nicely
  and the link to the UPLOAD AV works correctly
* Apply patch
* Verify the link still works and the sentence reads correctly.
  NOTE: now only UPLOAD will be linked.

If you are familiar with the process, you can also make sure
the strings now show up on po files as expected:
https://wiki.koha-community.org/wiki/Translating_Koha#Updating_the_po_files_in_your_installation

Signed-off-by: Caroline Cyr La Rose <caroline.cyr-la-rose@inlibro.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>

koha-tmpl/intranet-tmpl/prog/en/modules/tools/upload.tt

@@ -4,6 +4,7 @@
 [% USE KohaDates %]
 [% USE TablesSettings %]
 [% USE AuthorisedValues %]
+[%- USE KohaSpan -%]
 [% SET footerjs = 1 %]
 [% INCLUDE 'doc-head-open.inc' %]
 [% IF plugin %]
@@ -80,7 +81,8 @@
                 <div class="hint">
                     Note: No upload categories are defined.
                     [% IF ( CAN_user_parameters_manage_auth_values ) -%]
-                        <span>Add values to the <a href="/cgi-bin/koha/admin/authorised_values.pl?searchfield=UPLOAD">UPLOAD authorized value category</a> otherwise all uploads will be marked as temporary.</span>
+                        [% av_UPLOAD_link = BLOCK %]<a href='/cgi-bin/koha/admin/authorised_values.pl?searchfield=UPLOAD'>UPLOAD</a>[% END %]
+                        <span>Add values to the [% av_UPLOAD_link | $KohaSpan %] authorized value category otherwise all uploads will be marked as temporary.</span>
                     [% ELSE -%]
                         <span>An administrator must add values to the UPLOAD authorized value category otherwise all uploads will be marked as temporary.</span>
                     [% END %]