Bug 11996: Made RUB default currency for ru-RU

Bug 11996: Made RUB default currency for ru-RU

Didn't know how to change the uk-UA default currency.

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit 6bb8065af69438673ca5ed0bca0664c366a87e02)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit e001395c1a3afa53ea2df7cdd34738dd3ea6f0da)

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