How can I translate the 'Buy Now' button to Slovak?

[pokepopspot]

Hey there,

We keep having issues with the translation of the "buy it now" button on our website.
We are aware Slovak is not a supported language at this point but is there a way to find a solution for this. The button should translate to "Kúpiť". 
Would really appreciate a s solution here as we have been struggling for a long time.

Many Thanks.