Why are there 2 languages in Windows 10

Dear community

I have a question regarding installing windows in UK language despite i live in Denmark.

When i upgraded my windows i choose UK i had a UK win 7 before this. After the upgrade, i went and downloaded a UK ISO which i then reinstalled on my pc. All fine there.

Today i then notice that after searching for the calculator i couldnt find it, thinking hmm did they rename it, or simply not adding it. So i googled it, and the answer was windos+r and type in Calc. Ok hmm why, was my question. To my surprice when i then got it open i see that my calculator is in Danish?? Which is called a Lommeregner for the non danes so ofc after pressing start and searching for lom.... it finds it.

So my question is why is this in danish, i have then found out that some apps are in Danish after searching in all apps. For example my alarm and clock, pictures, movies and tv, groove music, Get office, calendar, camera, maps and some more just to mention a few. I did a clean install with UK windows, so why are some of my programs in danish?
And how can i change it. Only thing i have set in Windows to be Danish is region and keyboard settings. Language of the system is set to UK.

Try to remove Danish first from Keyboard and reboot. See if you still have Danish apps
Go there to see if you can remove Danish: Search windows/Settings/Time and language
If it's there delete it.

Or

Search windows/Settings/Time and language/Related Settings/Additional date.time.& Regional Settings/Advanced Settings: See if Danish is there and remove it.

Otherwise I'm afraid that you have corrupted files. Did you get the ISO file from Microsoft?
There ain't that much differences using English US for you. We don't see these things when clean install in US language. If you don't find Danish anywhere, you'll have to redo a clean install.

My main language is Eng US but I have French for the keyboard and I never experience such problems.
Download Windows 10 RTM Build 10240 ISO - Microsoft News

Good luck!