ruby - I18n::InvalidLocale: :en is not a valid locale -

i trying use i18n.transliterate "normalize" text accented characters can analyze , compare different languages.

however, when using method following error pops out

i18n::invalidlocale: :en not valid locale     /home/xxx/.rvm/gems/ruby-2.1.5/gems/i18n-0.7.0/lib/i18n.rb:284:in `enforce_available_locales!'     /home/xxx/.rvm/gems/ruby-2.1.5/gems/i18n-0.7.0/lib/i18n.rb:235:in `transliterate'     (irb):2     /home/xxx/.rvm/rubies/ruby-2.1.5/bin/irb:11:in `<main>' 

i have made searches problem , found solutions related rails configuration. using in ruby file, nothing related rails, so... can do?

i seem have similar problem resolved inspecting source code associated error.

i found have explicitly set available locales so:

i18n.config.available_locales = :en 

i'm not sure if correct approach, see following achieves same effect , more robust.