This code is an alternative to Lingua that does not work for Xcode 4.6.3....

genstringsHelper.rb

#!/usr/bin/ruby

require 'optparse'
require 'kconv'

def update(filepath, dictionary)
  puts filepath
	fr = File::open(filepath, "r")
	localizedSource = fr.read
	fr.close

	localizedDictionary = {}
	localizedSource.scan(/\"(.+?)\" = \"(.+?)\";/).each{|result|
		localizedDictionary[result[0]] = result[1]
	}

	new_entries = []

	dictionary.each_pair{|k, v|
		if localizedDictionary[k] == nil
			new_entries.push(k)
		end
	}

	fw = File::open(filepath, "w")
	localizedDictionary.each_pair{|k, v|
		fw.write("/* No comment provided by engineer. */\n")
		fw.write(sprintf("\"%s\" = \"%s\";\n\n", k, v))
	}
	new_entries.each{|k|
		fw.write("/* New entry */\n")
		fw.write(sprintf("\"%s\" = \"%s\";\n\n", k, k))
	}
	fw.close
end

def main
	argv = {}
	 
	OptionParser.new do |opt|
	  opt.on('--srcroot VALUE') do |v|
	  	argv[:srcroot] = v
	  end
	 	opt.parse!(ARGV)
	end

	p argv

	if !argv[:srcroot]
		return
	end

	path = argv[:srcroot] + "/**/*.m"

	files = ""

	Dir.glob(path).each{|file|
		files = files + " " + file
	}

	puts files

	`genstrings #{files} -o /tmp`
	stringsSource = File::open("/tmp/Localizable.strings", "r").read
	puts stringsSource = stringsSource.toutf8

	dictionary = {}
	stringsSource.scan(/\"(.+?)\" = \"(.+?)\";/).each{|result|
		dictionary[result[0]] = result[1]
	}

	searchPath = argv[:srcroot] + "/**/Localizable.strings"
	Dir.glob(searchPath).each{|stringsPath|
		update(stringsPath, dictionary)
	}
end

main