Wrong country translation. Please fix.

[Andrei Darashenka <adorosh2@it.org.by>]

Hello, 

I discover a wrong translation of our country to russian.
Please translate

#. Type: select
#. Choices
#: ../choose-mirror.templates:128
BY
---
BY (Беларусь)


instead of 


BY
---
BY (Белоруссия)


Best regards,
Andrei.