Everytime I restart HASS my front end language changes

Hi! Just tried. With Chrome mobile I got English language as expected (the last language selected from the combobox). With Chrome desktop v70.0.3538.110 it always revert to Polish (on that pc I have nothing related to Polish) even after clearing the cache and reloading the page.

Internet Explorer does not load the page at all. It raises an error here:

 if (navigator.language.includes('-')) {
      translation = languageGetTranslation(navigator.language.split('-')[0]);

The object does not support the property or the method ‘includes’

But what I’m trying to say is neither the browser nor the location should matter in any way about the front-end language. This should relies only on the settings configuration. Otherwise it make no sense to have a setting…