Bug 7821 - {langcode} will be replaced with current interface language

This makes bug 4032 support multi-language Koha installation which is important
for some of Koha users.

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
1) After update XSLT system preferences are set to 'default'. All views
(OPAC and staff, results and detail page) work and switching languages
selects the correct translated file.

2) Leaving empty works and normal views are used.

3) Putting in a single URL without placeholder works.

4) Putting in a URL with placeholder works. Created local directories
have to match the language codes.

NOTE: In order to make the URLs and patchs work, the Utils file needs to be
copied too.

Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>

C4/XSLT.pm

@@ -170,6 +170,12 @@ sub XSLTParse4Display {
                         "slim2OPACResults.xsl";
         }
     }
+
+    if ( $xslfilename =~ m/{langcode}/ ) {
+        my $lang = C4::Templates::_current_language;
+        $xslfilename =~ s/{langcode}/$lang/;
+    }
+
     # grab the XML, run it through our stylesheet, push it out to the browser
     my $record = transformMARCXML4XSLT($biblionumber, $orig_record);
     #return $record->as_formatted();

koha-tmpl/intranet-tmpl/prog/en/modules/admin/preferences/opac.pref

@@ -51,12 +51,12 @@ OPAC:
             - 'Display OPAC results using XSLT stylesheet at: '
             - pref: OPACXSLTResultsDisplay
               class: file
-            - '<br />Options:<br />- leave empty for "no xslt"<br />- enter "default" for the default one<br />- put a path to define a xslt file<br />- put an URL for an external specific stylesheet.'
+            - '<br />Options:<br />- leave empty for "no xslt"<br />- enter "default" for the default one<br />- put a path to define a xslt file<br />- put an URL for an external specific stylesheet.<br />{langcode} will be replaced with current interface language'
         -
             - 'Display OPAC details using XSLT stylesheet at: '
             - pref: OPACXSLTDetailsDisplay
               class: file
-            - '<br />Options:<br />- leave empty for "no xslt"<br />- enter "default" for the default one<br />- put a path to define a xslt file<br />- put an URL for an external specific stylesheet.'
+            - '<br />Options:<br />- leave empty for "no xslt"<br />- enter "default" for the default one<br />- put a path to define a xslt file<br />- put an URL for an external specific stylesheet.<br />{langcode} will be replaced with current interface language'
         -
             - On pages displayed with XSLT stylesheets on the OPAC,
             - pref: DisplayOPACiconsXSLT

koha-tmpl/intranet-tmpl/prog/en/modules/admin/preferences/staff_client.pref

@@ -54,12 +54,12 @@ Staff Client:
             - 'Display results in the staff client using XSLT stylesheet at: '
             - pref: XSLTResultsDisplay
               class: file
-            - '<br />Options:<br />- leave empty for "no xslt"<br />- enter "default" for the default one<br />- put a path to define a xslt file<br />- put an URL for an external specific stylesheet.'
+            - '<br />Options:<br />- leave empty for "no xslt"<br />- enter "default" for the default one<br />- put a path to define a xslt file<br />- put an URL for an external specific stylesheet.<br />{langcode} will be replaced with current interface language'
         -
             - 'Display details in the staff client using XSLT stylesheet at: '
             - pref: XSLTDetailsDisplay
               class: file
-            - '<br />Options:<br />- leave empty for "no xslt"<br />- enter "default" for the default one<br />- put a path to define a xslt file<br />- put an URL for an external specific stylesheet.'
+            - '<br />Options:<br />- leave empty for "no xslt"<br />- enter "default" for the default one<br />- put a path to define a xslt file<br />- put an URL for an external specific stylesheet.<br />{langcode} will be replaced with current interface language'
         -
             - Use the Yahoo UI libraries
             - pref: yuipath