text: import subprocess
  import re
  from collections import defaultdict
  
  authors_by_locale = defaultdict(set)
  
  file_listing = subprocess.Popen('find ../wagtail -iname *.po', shell=True, stdout=subprocess.PIPE)
  
  for file_listing_line in file_listing.stdout:
      filename = file_listing_line.strip()
  
      # extract locale string from filename
      locale = re.search(r'locale/(\w+)/LC_MESSAGES', filename).group(1)
      if locale == 'en':
          continue
  
      # read author list from each file
      with file(filename) as f:
          has_found_translators_heading = False
          for line in f:
              line = line.strip()
              if line.startswith('#'):
                  if has_found_translators_heading:
                      author = re.match(r'\# (.*), [\d\-]+', line).group(1)
                      authors_by_locale[locale].add(author)
                  elif line.startswith('# Translators:'):
                      has_found_translators_heading = True
              else:
                  if has_found_translators_heading:
                      break
                  else:
                      raise Exception("No 'Translators:' heading found in %s" % filename)
  
  locales = sorted(authors_by_locale.keys())
  for locale in locales:
      print(locale)
      print("-----")
      for author in sorted(authors_by_locale[locale]):
          print(author)
      print('')
  