new_contents: from django import template
  
  register = template.Library()
  
  @register.filter()
  def replace(value, argstr):
      parts = argstr.split(",")
      fromstr = parts[0] if len(parts) >= 1 else ""
      tostr = parts[1] if len(parts) >= 2 else ""
      return value.replace(fromstr, tostr)
  
subject: add forgotten templatetags file