Insert language code into a link

Hi,
I have WordPress site and use TranslatePress to translate into my language KM.

Everything is working find when I click on translate switch button then it goes to like this:

mysite.com/km/categories/productName

I have use Elementor to create a button that link to my specific product by manually inset product link into Elementor element on LINK URL like this:

/categories/productName then the site will auto fill like this mysite.com/categories/productName

when I click on the button it’s working good but it switch to English not KM like this:

mysite.com/km/categories/productName

Could you tell me how to insert language code into this manually URL?