Very good working

Sprogpacke virker perfekt his man følger denne manual:
Valgt løsning

rat wrote:

Is downloading and installing the Firefox with the language the only solution?

It's the preferred solution.

If you need to switch between different interface languages,

Install the language pack for the desired languages.
https://addons.mozilla.org/firefox/language-tools/
Type about:config into the address bar and press Enter.
To bypass the warning, press the big button labeled "I'll be careful, I promise!".
In the search box, paste intl.locale.matchOS
In the search results, if intl.locale.matchOS is set to true, double-click it to set its value to false.
In the search box, paste general.useragent.locale
In the search results, double-click general.useragent.locale and set its value to the desired language.
Restart Firefox for the change to take effect.

If you need to switch languages frequently, you may want to get an add-on like Simple Locale Switcher.

https://addons.mozilla.org/firefox/addon/simple-locale-switcher/

Jeg giver ikke meget for dette her. Sprogpakken bliver den ene gang efter den anden overrulet af engelsk, selv om man "vælger" dansk kører det videre med engelsk. For dårlig

Cukup Lumayan baguslah, saya masih perlu belajar lagi dalam pengunaannya