text: from __future__ import unicode_literals
  
  import pycountry
  
  from django.utils.translation import ugettext_lazy as _
  
  from smart_settings import Namespace
  
  # TODO: Findout method to make languages names' translatable.
  # YAML fails to serialize ugettext_lazy and ugettext is not allowed at this
  # level
  
  LANGUAGE_CHOICES = [
      (i.iso639_3_code, i.name) for i in list(pycountry.languages)
  ]
  
  namespace = Namespace(name='documents', label=_('Documents'))
  setting_storage_backend = namespace.add_setting(
      global_name='DOCUMENTS_STORAGE_BACKEND',
      default='storage.backends.filebasedstorage.FileBasedStorage'
  )
  setting_preview_size = namespace.add_setting(
      global_name='DOCUMENTS_PREVIEW_SIZE', default='640x480'
  )
  setting_print_size = namespace.add_setting(
      global_name='DOCUMENTS_PRINT_SIZE', default='3600'
  )
  setting_thumbnail_size = namespace.add_setting(
      global_name='DOCUMENTS_THUMBNAIL_SIZE', default='50x50'
  )
  setting_display_size = namespace.add_setting(
      global_name='DOCUMENTS_DISPLAY_SIZE', default='3600'
  )
  setting_recent_count = namespace.add_setting(
      global_name='DOCUMENTS_RECENT_COUNT', default=40,
      help_text=_(
          'Maximum number of recent (created, edited, viewed) documents to '
          'remember per user.'
      )
  )
  setting_zoom_percent_step = namespace.add_setting(
      global_name='DOCUMENTS_ZOOM_PERCENT_STEP', default=25,
      help_text=_(
          'Amount in percent zoom in or out a document page per user '
          'interaction.'
      )
  )
  setting_zoom_max_level = namespace.add_setting(
      global_name='DOCUMENTS_ZOOM_MAX_LEVEL', default=300,
      help_text=_(
          'Maximum amount in percent (%) to allow user to zoom in a document '
          'page interactively.'
      )
  )
  setting_zoom_min_level = namespace.add_setting(
      global_name='DOCUMENTS_ZOOM_MIN_LEVEL', default=25,
      help_text=_(
          'Minimum amount in percent (%) to allow user to zoom out a document '
          'page interactively.'
      )
  )
  setting_rotation_step = namespace.add_setting(
      global_name='DOCUMENTS_ROTATION_STEP', default=90,
      help_text=_(
          'Amount in degrees to rotate a document page per user interaction.'
      )
  )
  setting_cache_storage_backend = namespace.add_setting(
      global_name='DOCUMENTS_CACHE_STORAGE_BACKEND',
      default='documents.storage.LocalCacheFileStorage'
  )
  setting_language = namespace.add_setting(
      global_name='DOCUMENTS_LANGUAGE', default='eng',
      help_text=_('Default documents language (in ISO639-2 format).')
  )
  setting_language_choices = namespace.add_setting(
      global_name='DOCUMENTS_LANGUAGE_CHOICES', default=LANGUAGE_CHOICES,
      help_text=_('List of supported document languages.')
  )
  