Switch from English to Danish NBK752 NBR750

Very strange.  Just now, I changed language on an RBR750 router from 'Auto' to 'Dansk' (and back).

I find the description of the language selection process confusing. When the screen says, "Please wait for updating the..." the user probably infers that this means the router is connecting to some site at Netgear and downloading a file.  My original RBR50 router had a provision to open a command line access (telnet).  When doing that, it is obvious that the web site code has a directory called "Language" which has individual Java Script files for  27 languages.  I extracted the file "Danish.js" and saved it to a Dropbox:

https://www.dropbox.com/scl/fi/er3yl6ps1es973j5sdr5p/Danish.js?rlkey=njfc7lyk1quz78mqbt8ems2e5&dl=0 

Thus my understanding is that changing language is done internally (in the web code) by running a Java Script to replace hundreds of variables with new content. There is no network connection.

If every language except Dansk seems to work, perhaps there is something wrong with the "Danish.js" file in the web code.

• Maybe it is not present for the NBR750 firmware?
• Maybe it has been corrupted somehow?

Netgear customers in the US are often surprised to learn that the purchase of an Orbi system entitles them to only 90 days of 'complimentary support', after which they can either purchase a support contract from Netgear or turn to community forums for assistance.  I have a vague memory of seeing a comment that customers in some countries have more 'customer friendly' support rights.  Is perhaps Denmark one of the countries where customers are due more support than customers in the US?