new_contents: import sys
  from dplace_app.models import *
  
  MISSING_CODES = []
  
  def run(mode=None):
      if mode == 'langs':
          clear_langs()
  
  def clear_langs():
      LanguageClassification.objects.all().delete()
      LanguageClass.objects.all().delete()
      LanguageFamily.objects.all().delete()
      Language.objects.all().delete()
  
  if __name__ == '__main__':
      run(sys.argv[1])
  
subject: Add script to clear data. Just languages so far