Lists conflicting translations from your Rails locale files. Note that it will only detect conflicts between different locale files. Conflicts within a single locale file will not be detected.

rails-locales-conflicts.rb

#!/usr/bin/env ruby

# Usage: ruby rails-locales-conflicts.rb [<rails root>]

require "pathname"
require "yaml"

class Translations
  def initialize
    @translations = Hash.new do |h, k|
      h[k] = {}
    end
  end

  def merge_locale!(locale, prefix: [], source:)
    locale.each do |key, value|
      prefixed_key = [ *prefix, key ]
      case value
      when Hash
        merge_locale!(value, prefix: prefixed_key, source: source)
      else
        add_translation(prefixed_key, value, source: source)
      end
    end
  end

  def conflicts
    @translations.select { |_, v| v.size > 1 }
  end

  private

  def add_translation(key, value, source:)
    @translations[key].merge!(source => value)
  end
end

locales_dir  = Pathname(ARGV.first || ".").join("config", "locales")
locale_files = Pathname.glob(locales_dir.join("**", "*.yml"))

translations = locale_files.each_with_object(Translations.new) do |locale_file, txns|
  source = locale_file.relative_path_from(locales_dir).to_s
  txns.merge_locale! YAML.load(locale_file.read), source: source
end

puts translations.conflicts.map { |k, v| "#{k.inspect} => #{v.inspect}" }