code: def get_translation(self, lang, field):
          
          # Read from cache
          key = self._get_translation_cache_key(lang, field)
          trans = cache.get(key, '')
  
          if not trans:
              trans_obj = self.get_translation_obj(lang, field)
              trans = getattr(trans_obj, 'translation', '')
              # if there's no translation text fall back to the model field
              if not trans:
                  trans = getattr(self, field, '')
              # update cache
              cache.set(key, trans)
          return trans
docs: Return the translation string of an specific field in a Translatable
          istance
  
          @type lang: string
          @param lang: a string with the name of the language
  
          @type field: string
          @param field: a string with the name that we try to get
  
          @rtype: string
          @return: Returns a translation string