application_controller.rb

# application_controller.rb
  init_gettext "kick"
  GetText.locale = "bg"
# ....

environment.rb

# environment.rb
# ...
  config.gem "locale"
  config.gem "locale_rails"
  config.gem "gettext"
  config.gem "gettext_activerecord"
  config.gem "gettext_rails"
# ...

index.html.erb

# index.html.erb
# ...
<%= distance_of_time_in_words(Time.now, Time.now + 50.minutes %>

# ...
# ...
# and the output is
translation missing: bg, datetime, distance_in_words, about_x_hours