Bug 41332: Add Greek to KohaManualLanguage system preference

The Koha Manual has been translated into Greek:
https://koha-community.org/manual/latest/el/html/index.html

However, 'Greek' is missing from the list of languages
available in the 'KohaManualLanguage' System Preference.

This patch fixes that.

Test plan:

1) Without the patch, visit Administration > System preferences >
   Enhanced content, and under the 'Manual' section notice that
   'Greek' is missing from the options of the 'KohaManualLanguage'
   syspref dropdown.
2) Apply the patch, and run updatedatabase.pl
   The 'KohaManualLanguage' dropdown should now list 'Greek'.

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

Koha/Manual.pm

@@ -57,7 +57,7 @@ Use system preferences 'KohaManualLanguage' and 'KohaManualBaseURL' to properly
 sub _get_base_url {
     my ($preferred_language) = @_;
 
-    my @available_languages = qw( en ar cs es fr it pt_BR tz zh_TW );
+    my @available_languages = qw( el en ar cs es fr it pt_BR tz zh_TW );
 
     my ($language) = grep {
         my $preferred_short = substr $preferred_language, 0, 2;

installer/data/mysql/atomicupdate/bug_41332.pl

@@ -0,0 +1,18 @@
+use Modern::Perl;
+use Koha::Installer::Output qw(say_warning say_success say_info);
+
+return {
+    bug_number  => "41332",
+    description => "Adds new option for Greek (el) to system preference 'KohaManualLanguage'",
+    up          => sub {
+        my ($args) = @_;
+        my ( $dbh, $out ) = @$args{qw(dbh out)};
+
+        $dbh->do(
+            q{
+            UPDATE systempreferences SET options = 'el|en|ar|cs|de|es|fr|it|pt_BR|tr|zh_TW' WHERE variable = 'KohaManualLanguage'
+            }
+        );
+        say_success( $out, "Added new option for Greek (el) to system preference 'KohaManualLanguage'" );
+    },
+};

installer/data/mysql/mandatory/sysprefs.sql

@@ -380,7 +380,7 @@ INSERT INTO systempreferences ( `variable`, `value`, `options`, `explanation`, `
 ('JobsNotificationMethod','STOMP','polling|STOMP','Define the preferred job worker notification method','Choice'),
 ('KohaAdminEmailAddress','root@localhost','','Define the email address where patron modification requests are sent','free'),
 ('KohaManualBaseURL','https://koha-community.org/manual/','','Where is the Koha manual/documentation located?','Free'),
-('KohaManualLanguage','en','en|ar|cs|de|es|fr|it|pt_BR|tr|zh_TW','What is the language of the online manual you want to use?','Choice'),
+('KohaManualLanguage','en','el|en|ar|cs|de|es|fr|it|pt_BR|tr|zh_TW','What is the language of the online manual you want to use?','Choice'),
 ('LabelMARCView','standard','standard|economical','Define how a MARC record will display','Choice'),
 ('LanguageToUseOnMerge','',NULL,'If set, the authority field having the given language code in its $7 subfield will be used in the bibliographic record if it exists, rather than the first field. The code can be in a short, 2 characters long form (example: ba for latin) or in a long, 8 characters long form, with the short form in position 5 and 6 starting from 1 (example: ba0yba0y for latin). A list of available codes can be found here: https://documentation.abes.fr/sudoc/formats/unmb/DonneesCodees/CodesZone104.htm#$d. Please note that this feature is available only for UNIMARC.','Free'),
 ('LibraryName','','','Define the library name as displayed on the OPAC',''),

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

@@ -422,6 +422,7 @@ Enhanced content:
             - Language of the online manual
             - pref: KohaManualLanguage
               choices:
+                el: Greek
                 en: English
                 ar: Arabic
                 cs: Czech