clf.rb

require 'yaml'

def main
  lang_file_1 = ARGV[0]
  lang_file_2 = ARGV[1]

  lang_1 = YAML::load(File.open lang_file_1)
  lang_2 = YAML::load(File.open lang_file_2)

  lang_1_key = lang_1.keys.first
  lang_2_key = lang_2.keys.first

  @keys = {}
  all_keys lang_1[lang_1_key]
  lang_1_keys = @keys
  @keys = {}
  all_keys lang_2[lang_2_key]
  lang_2_keys = @keys

  a_not_in_b = lang_1_keys.keys - lang_2_keys.keys
  b_not_in_a = lang_2_keys.keys - lang_1_keys.keys

  if a_not_in_b.empty? && b_not_in_a.empty?
    puts "============================"
    puts "Both files contain same keys"
    puts "============================"
  else
    puts "========================================================"
    puts "Keys exist in the first file, but not in the second one"
    puts "========================================================"
    a_not_in_b.each do |key|
      puts "#{key}: #{lang_1_keys[key]}"
    end
    puts "\n\n"
    puts "========================================================"
    puts "Keys exist in the second file, but not in the first one"
    puts "========================================================"
    b_not_in_a.each do |key|
      puts "#{key}: #{lang_2_keys[key]}"
    end
  end
end

def all_keys hash, parent = ""

  hash.each do |key, value|
    if value.is_a? Hash
      @keys.merge all_keys(value, [parent, key].select{|i| i unless i == ""}.join("."))
    else
      @keys[[parent, key].select{|i| i unless i == ""}.join(".")] = value
    end
  end
end

main

Second version of https://gist.github.com/bajalovic/b9936be1463f3cdb2e1b

In this version, output is translation_key: value