Bug 20785: Advanced Editor does not honor MarcFieldDocURL

The advanced MARC editor, Rancor, doesn't obey MarcFieldDocURL.
Make it do so.

Test plan:

1) Enable EnableAdvancedCatalogingEditor
2) Set MarcFieldDocURL to eg. http://{MARC}.example.com/{LANG}/{FIELD}
3) Go to Cataloging -> Advanced editor
4) Go to any field and press Ctrl-H
5) Marc field documentation on www.loc.gov or ifla.org should open
6) Apply patch
7) Repeat 3 and 4. The Marc field docs should open on the URL you set

Signed-off-by: Pasi Kallinen <pasi.kallinen@joensuu.fi>
Signed-off-by: Michal Denar <black23@gmail.com>

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit ca839922fd)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 0f2d80328d)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>

koha-tmpl/intranet-tmpl/prog/en/includes/cateditor-ui.inc

@@ -1,3 +1,4 @@
+[% USE Koha %]
 <script src="[% interface %]/lib/codemirror/codemirror-compressed.js"></script>
 <script src="[% interface %]/lib/filesaver.js"></script>
 <script src="[% interface %]/lib/koha/cateditor/marc-mode.js"></script>
@@ -169,7 +170,13 @@ require( [ 'koha-backend', 'search', 'macros', 'marc-editor', 'marc-record', 'pr
     }
 
     function getFieldHelpURL( tag ) {
-        [% IF ( marcflavour == 'MARC21' ) %]
+        [% IF Koha.Preference('marcfielddocurl') %]
+            var docurl = "[% Koha.Preference('marcfielddocurl').replace('"','&quot;') | html %]";
+            docurl = docurl.replace("{MARC}", "[% marcflavour | html %]");
+            docurl = docurl.replace("{FIELD}", ""+tag);
+            docurl = docurl.replace("{LANG}", "[% lang | html %]");
+            return docurl;
+        [% ELSIF ( marcflavour == 'MARC21' ) %]
             if ( tag == '000' ) {
                 return "http://www.loc.gov/marc/bibliographic/bdleader.html";
             } else if ( tag >= '090' && tag < '100' ) {