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These are the code parts to grab related to this blog post.
Read more about it there 

http://www.igumbi.com/en/blog/YAML-to-JSON-Rails-for-i18n-Language-Files


# The locale file structure de.yml

  de:
    obt:
      online_booking_tool: "online Buchungstool"
      book: "Buchen"
      save: "Speichern"
      edit: "Bearbeiten"´

# The Rake Task assets.rake

    desc "create a static javascript translation file with each language available as a JSON object"
    task :jslang => :environment do
      languages  = %w(de en)
      langfilejs = "public/javascripts/seller/obtlang.js"
      namespace  = "obt"
      file=File.new(langfilejs,"w")
      languages.each do |lang|
        langfile=YAML::load(File.open("config/locales/#{lang}.yml"))
        file.write(namespace+lang+"="+langfile[lang][namespace].to_json+";\n\n")
      end
      file.close
    end

# The Javascript translation method

	var Obt = {
		t: function(key){
			if (Igumbi[Igumbi.lang][key]) {
				return(Igumbi[Igumbi.lang][key]);
    	}
    	return("<span style='color:red; 	font-size:2em;'>"+key+"("+Igumbi.lang+") translation missing</span>");
		}
	}