A little code to validate your entire repo for proper UTF-8 encoding.

Ruby utf-8 Validator

#!/usr/bin/env ruby

class Utf8Checker
  def initialize(path = `pwd`.chomp)
    @files = Dir["#{path}/**/**"]
    @total_num = @files.count
    puts "#{@total_num} files to process."
    @num_left = @total_num
    @valid = false
    @err = false
    @extension_hash = Hash.new(0)
  end
  def process
    @files.each do |file|
      @valid = true
      @err = false
      begin
        unless /\.(jpg|png|gif)$/ =~ file
          if /text/ =~ `file #{file}`.chomp
            ext = file.match(/\.([a-z]{3,5})$/)
            @extension_hash[file.match(/\.([a-z]{3,5})$/)[1]] += 1 if ext
            @valid = File.read(file).force_encoding("utf-8").valid_encoding?
          end
        end
      rescue ArgumentError => e
        unless /\.(jpg|png|gif)$/ =~ file
          @valid = false
          @err = true
        end
      end
      unless @valid
        puts
        puts "File #{file} has INVALID utf-8 encoding!#{' ' + e.message if @err}"
      end
      @num_left -= 1
      # print '.' if num_left % 10 == 0
      puts "#{@num_left} left to process" if @num_left % 1000 == 0
    end
    ""
    @extension_hash
  end
end

u = Utf8Checker.new; nil
u.process