#6 Problem with russian letters in upper case

[Anonymous]

Originally created by: SerSo1... (code.google.com)@gmail.com

What steps will reproduce the problem?
1. Try to search product by keyword in russian letter containing capitals

What is the expected output? What do you see instead?
Expected output for 'Кольцо' is stored in database product with name 'кольцо'.
(As for english 'Ring' results with lower case 'R' are retrieved - 'ring')

What version of the product are you using? On what operating system?
Latest version on current moment - v1.4.9.4

Please provide any additional information below.
In search controller strtolower has to be substituted with mb_strtolower and specified charset