My problem is simillar to Rails 3 invalid multibyte char (US-ASCII)
Solution, presented there does works, but i find this a little goofy to include comment # encoding: UTF-8 to every file, that uses non ASCII characters.
In config/application.rb, i have following option:
# Configure the default encoding used in templates for Ruby 1.9.
config.encoding = "utf-8"
But, it does't helps.
Maybe, some another global configuration option is presented exactly for such cases ?