old_contents: import io
  import sys
  
  from django.conf import locale
  
  
  class classproperty(property):
      """
      Use it to decorate a classmethod to make it a "class property".
      """
      def __get__(self, cls, owner):
          return self.fget.__get__(None, owner)()
  
  
  class TextIOWrapper(io.TextIOWrapper):
      def __init__(self, buffer, encoding=None, **kwargs):
          if encoding is None:
              try:
                  buffer.read().decode('utf-8')
  
              except UnicodeDecodeError:
                  # FIXME: If this ever causes problems, we can go with cchardet
                  encoding = 'latin-1'
  
              else:
                  encoding = 'utf-8'
  
              buffer.seek(0)
  
          super().__init__(buffer, encoding=encoding, **kwargs)
  
  
  def get_all_languages():
      languages = []
  
      for language, lang_data in locale.LANG_INFO.items():
          try:
              languages.append(
                  (language, lang_data['name_local'].capitalize())
              )
  
          except KeyError:
              # That language doesn't have a local name, only a fallback
              continue
  
      return sorted(languages)
  
  
  # We do not use functool.partial cause we want to mock stderr for unittest
  # If we use partial we keep a ref to the original sys.stderr and output is not
  # captured.
  def printerr(*args, **kwargs):
      kwargs['file'] = sys.stderr
      kwargs['flush'] = True
      return print(*args, **kwargs)
  
  
  def to_unicode(text):
      """Do its best to return an unicode string."""
      text = text or ''
      if isinstance(text, str):
          return text
      else:
          try:
              text = text.decode('utf-8')
          except UnicodeDecodeError:
              text = text.decode('latin-1')
          return text
  
new_contents: import io
  import sys
  
  from django.conf import locale
  
  
  class classproperty(property):
      """
      Use it to decorate a classmethod to make it a "class property".
      """
      def __get__(self, cls, owner):
          return self.fget.__get__(None, owner)()
  
  
  class TextIOWrapper(io.TextIOWrapper):
      def __init__(self, buffer, encoding=None, **kwargs):
          if encoding is None:
              content = buffer.read()
  
              try:
                  content.decode('utf-8')
  
              except UnicodeDecodeError:
                  # FIXME: If this ever causes problems, we can go with cchardet
                  encoding = 'latin-1'
  
              else:
                  encoding = 'utf-8'
  
              buffer = io.BytesIO(content)
  
          super().__init__(buffer, encoding=encoding, **kwargs)
  
  
  def get_all_languages():
      languages = []
  
      for language, lang_data in locale.LANG_INFO.items():
          try:
              languages.append(
                  (language, lang_data['name_local'].capitalize())
              )
  
          except KeyError:
              # That language doesn't have a local name, only a fallback
              continue
  
      return sorted(languages)
  
  
  # We do not use functool.partial cause we want to mock stderr for unittest
  # If we use partial we keep a ref to the original sys.stderr and output is not
  # captured.
  def printerr(*args, **kwargs):
      kwargs['file'] = sys.stderr
      kwargs['flush'] = True
      return print(*args, **kwargs)
  
  
  def to_unicode(text):
      """Do its best to return an unicode string."""
      text = text or ''
      if isinstance(text, str):
          return text
      else:
          try:
              text = text.decode('utf-8')
          except UnicodeDecodeError:
              text = text.decode('latin-1')
          return text
  
subject: Make the TextIOWrapper not rely on seek