gistfile1.rb

# lib/liquid_i18n_rails.rb
module LiquidI18nRails
  def t(string)
    I18n.t(string.to_sym)
  end
end

# config/initializers/liquid.rb
require 'liquid_i18n_rails'
Liquid::Template.register_filter LiquidI18nRails

# and then:
{{ 'string' | t }}
# where 'string' is name of sym for I18n.t
# it will do .to_sym automatically