Bug 29596: Add Yiddish language

Bug 29596: Add Yiddish language

This patch adds the Yiddish language to Koha. The language codes were
taken from https://www.loc.gov/standards/iso639-2/php/code_list.php

Sponsored-by: Universidad Nacional de San Martín
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit 808fb2679bb4c3574589486546d61e0d392c8368)

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>