The rulebook and game components will be digitally translated to all 6 languages, no matter the number of backers.
To also print the translated components (power cards and hero pads) we will need 100 copies for each language. In the community tab of the campaign you can get an idea, but keep in mind that includes 1€ backers as well: https://www.kickstarter.com/projects/999897216/skytear/community
The good news is that we are looking for publishers, retailers, and distributors to buy dozens or hundreds of copies at once.
We are talking with partners in Germany, France, and Italy, that could unlock a language all by themselves.
We will make updates during the campaign as soon as a language is 100% secured.