This was only fixed on Feb 14th 2011:
https://rails.lighthouseapp.com/projects/8994/tickets/4525-favor-in-all-code-instead-of-deprecated-as-interpolation-syntax-for-i18n
require 'i18n/version'
if I18n::VERSION > '0.3.7' && Rails::VERSION::STRING < '3.0.0'
module I18n::Backend::Base
def warn_syntax_deprecation!
# nothing
end
end
end
