After upgrading our odoo environment to version 16. we can't seem to access the helpdesk.team app anymore when swedish language is set. It works if the lang is set to english. 

Here is the full error:

Traceback (most recent call last):
  File "/home/odoo/odoo/lib/odoo/odoo/tools/cache.py", line 85, in lookup
    r = d[key]
  File "", line 2, in __getitem__
  File "/home/odoo/odoo/lib/odoo/odoo/tools/func.py", line 87, in locked
    return func(inst, *args, **kwargs)
  File "/home/odoo/odoo/lib/odoo/odoo/tools/lru.py", line 34, in __getitem__
    a = self.d[obj]
KeyError: ('helpdesk.team', , (False, 'form', None, 'sv_SE'))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/odoo/odoo/lib/odoo/odoo/http.py", line 1583, in _serve_db
    return service_model.retrying(self._serve_ir_http, self.env)
  File "/home/odoo/odoo/lib/odoo/odoo/service/model.py", line 134, in retrying
    result = func()
  File "/home/odoo/odoo/lib/odoo/odoo/http.py", line 1610, in _serve_ir_http
    response = self.dispatcher.dispatch(rule.endpoint, args)
  File "/home/odoo/odoo/lib/odoo/odoo/http.py", line 1807, in dispatch
    result = self.request.registry['ir.http']._dispatch(endpoint)
  File "/home/odoo/odoo/lib/odoo/odoo/addons/base/models/ir_http.py", line 154, in _dispatch
    result = endpoint(**request.params)
  File "/home/odoo/odoo/lib/odoo/odoo/http.py", line 696, in route_wrapper
    result = endpoint(self, *args, **params_ok)
  File "/home/odoo/odoo/lib/odoo/addons/web/controllers/dataset.py", line 42, in call_kw
    return self._call_kw(model, method, args, kwargs)
  File "/home/odoo/odoo/lib/odoo/addons/web/controllers/dataset.py", line 33, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "/home/odoo/odoo/lib/odoo/odoo/api.py", line 457, in call_kw
    result = _call_kw_model(method, model, args, kwargs)
  File "/home/odoo/odoo/lib/odoo/odoo/api.py", line 430, in _call_kw_model
    result = method(recs, *args, **kwargs)
  File "/home/odoo/odoo/lib/odoo/odoo/addons/base/models/ir_ui_view.py", line 2494, in get_views
    for [v_id, v_type] in views
  File "/home/odoo/odoo/lib/odoo/odoo/addons/base/models/ir_ui_view.py", line 2494, in 
    for [v_id, v_type] in views
  File "/home/odoo/odoo/lib/odoo/odoo/addons/base/models/ir_ui_view.py", line 2674, in get_view
    result = dict(self._get_view_cache(view_id, view_type, **options))
  File "", line 2, in _get_view_cache
  File "/home/odoo/odoo/lib/odoo/odoo/tools/cache.py", line 90, in lookup
    value = d[key] = self.method(*args, **kwargs)
  File "/home/odoo/odoo/lib/odoo/odoo/addons/base/models/ir_ui_view.py", line 2637, in _get_view_cache
    arch, models = view.postprocess_and_fields(arch, model=self._name, **options)
  File "/home/odoo/odoo/lib/odoo/odoo/addons/base/models/ir_ui_view.py", line 1036, in postprocess_and_fields
    name_manager = self._postprocess_view(node, model or self.model, **options)
  File "/home/odoo/odoo/lib/odoo/odoo/addons/base/models/ir_ui_view.py", line 1181, in _postprocess_view
    transfer_node_to_modifiers(node, node_info['modifiers'])
  File "/home/odoo/odoo/lib/odoo/odoo/addons/base/models/ir_ui_view.py", line 84, in transfer_node_to_modifiers
    modifiers.update(ast.literal_eval(attrs.strip()))
  File "/usr/lib/python3.7/ast.py", line 46, in literal_eval
    node_or_string = parse(node_or_string, mode='eval')
  File "/usr/lib/python3.7/ast.py", line 35, in parse
    return compile(source, filename, mode, PyCF_ONLY_AST)
  File "", line 1
    ”{’invisible’:
    ^
SyntaxError: invalid character in identifier

The above server error caused the following client error:
RPC_ERROR: Odoo Server Error
    at makeErrorFromResponse (https://odoo.w4r.se/web/assets/debug/web.assets_backend.js:10529:19) (/web/static/src/core/network/rpc_service.js:34)
    at XMLHttpRequest. (https://odoo.w4r.se/web/assets/debug/web.assets_backend.js:10582:27) (/web/static/src/core/network/rpc_service.js:87)

Any help would greatly be appreciated and upvoted!