Ok so for start with this you need go to the FikitRDR2 folder ( Menu Crash ).

Find the English.json and make a Copy of the file. Save the Copy on any place, is just a backup.

Now for make the translation just Open the English.json and you should see something like the next:

There are simple rules: 1.- When you end a line, the end of the line should be a (comma) , 2.- Every line is a text on the menu. 3.- Left Text is the ID, and the Right text is the TEXT that you need to edit. 4.- The file should start with a { and end with a }

So with this rules take the next as example, from English to Korea language:

As you see we only change the right text, cause remember rules (LEFT IS THE ID used by the menu) and (RIGHT IS THE REAL TEXT DISPLAYED ON MENU).

Pleas remember that the English.json is auto generated and can contain numbers, model hash thosed should no be translated.

So finally when you end change the name of File to the target language from example:

(Renaming from English to Korean).

Pleas take on mind if when you rename the file don’thave .json dont add it, maybe you system dont display the files extension, like the picture we know the file is a JSON but while renaming only change (English to Korean).