How to use
First, you need luma which means you should take a look on that =>
https://3ds.guide/
Second, you need to use the ingame patcher of luma =>
https://github.com/AuroraWright/Luma3DS/wiki/Options-and-usage
If you managed to download the file, you need to extract it under the luma titles directory on your sd card.
It looks like this "SD CARD ROOT"/luma/titles/, if the folder is not there, you must create the folder
The downloaded file contains a folder with the titleid as its name. You need to put that folder under the mentioned path.
It should look like this now .../luma/titles/00040000001B4300/...
You must reinstall the 1.3 update that I provided for a full translation