Cannot add manufacturers

[mase76]

Hi!
When I am trying to add an manufacturer, I get a server error (500) and this traceback:

File "/home/partuniverse/env/lib/python3.9/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/home/partuniverse/env/lib/python3.9/site-packages/django/core/handlers/base.py", line 145, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/home/partuniverse/env/lib/python3.9/site-packages/django/core/handlers/base.py", line 143, in _get_response
    response = response.render()
  File "/home/partuniverse/env/lib/python3.9/site-packages/django/template/response.py", line 106, in render
    self.content = self.rendered_content
  File "/home/partuniverse/env/lib/python3.9/site-packages/django/template/response.py", line 81, in rendered_content
    template = self.resolve_template(self.template_name)
  File "/home/partuniverse/env/lib/python3.9/site-packages/django/template/response.py", line 63, in resolve_template
    return select_template(template, using=self.using)
  File "/home/partuniverse/env/lib/python3.9/site-packages/django/template/loader.py", line 42, in select_template
    return engine.get_template(template_name)
  File "/home/partuniverse/env/lib/python3.9/site-packages/django/template/backends/django.py", line 34, in get_template
    return Template(self.engine.get_template(template_name), self)
  File "/home/partuniverse/env/lib/python3.9/site-packages/django/template/engine.py", line 143, in get_template
    template, origin = self.find_template(template_name)
  File "/home/partuniverse/env/lib/python3.9/site-packages/django/template/engine.py", line 125, in find_template
    template = loader.get_template(name, skip=skip)
  File "/home/partuniverse/env/lib/python3.9/site-packages/django/template/loaders/cached.py", line 54, in get_template
    template = super().get_template(template_name, skip)
  File "/home/partuniverse/env/lib/python3.9/site-packages/django/template/loaders/base.py", line 29, in get_template
    return Template(
  File "/home/partuniverse/env/lib/python3.9/site-packages/django/template/base.py", line 156, in __init__
    self.nodelist = self.compile_nodelist()
  File "/home/partuniverse/env/lib/python3.9/site-packages/django/template/base.py", line 194, in compile_nodelist
    return parser.parse()
  File "/home/partuniverse/env/lib/python3.9/site-packages/django/template/base.py", line 478, in parse
    raise self.error(token, e)
  File "/home/partuniverse/env/lib/python3.9/site-packages/django/template/base.py", line 476, in parse
    compiled_result = compile_func(self, token)
  File "/home/partuniverse/env/lib/python3.9/site-packages/django/template/loader_tags.py", line 266, in do_extends
    nodelist = parser.parse()
  File "/home/partuniverse/env/lib/python3.9/site-packages/django/template/base.py", line 478, in parse
    raise self.error(token, e)
  File "/home/partuniverse/env/lib/python3.9/site-packages/django/template/base.py", line 476, in parse
    compiled_result = compile_func(self, token)
  File "/home/partuniverse/env/lib/python3.9/site-packages/django/template/loader_tags.py", line 209, in do_block
    nodelist = parser.parse(('endblock',))
  File "/home/partuniverse/env/lib/python3.9/site-packages/django/template/base.py", line 449, in parse
    raise self.error(token, e)
  File "/home/partuniverse/env/lib/python3.9/site-packages/django/template/base.py", line 447, in parse
    filter_expression = self.compile_filter(token.contents)
  File "/home/partuniverse/env/lib/python3.9/site-packages/django/template/base.py", line 563, in compile_filter
    return FilterExpression(token, self)
  File "/home/partuniverse/env/lib/python3.9/site-packages/django/template/base.py", line 657, in __init__
    filter_func = parser.find_filter(filter_name)
  File "/home/partuniverse/env/lib/python3.9/site-packages/django/template/base.py", line 569, in find_filter
    raise TemplateSyntaxError("Invalid filter: '%s'" % filter_name)
django.template.exceptions.TemplateSyntaxError: Invalid filter: 'semanticui'`