Sorry for misunderstanding.
Correct language indication is not about spelling.
Properly specifying languages in the HTML code is about SEO – Search Engine Optimization – and SEM – Search Engine Marketing –
For a good result, it is important to follow the instructions given here:
Google Search Console
https://search.google.com/search-console/about
and
Webmaster Tools – Bing
https://www.bing.com/toolbox/webmaster
and
Yandex Webmaster
https://webmaster.yandex.com/welcome/
and many more.
When the wrong language is set, the site can get unnecessarily poor ranking in the search engine result.
“Norwegian BokmÃ¥l” and “Norwegian Nynorsk” are two different languages.
When you specify the wrong language in the HTML code, you counteract the recommendations given in the links above.