Plugin translation and customization

Hello!

I purchased the Fundraising plugin today and I must say that so far, it's living up to expectations. Great job, guys.

However I have a question about translating and customizing specific elements - those that can't be edited or changed through the WP dashboard. I need to translate a few words from english to slovenian and change the size of an input field where people can enter the donation amount in. Where can I make these changes, in what files?

Again, thanks for this great plugin and help.

Best regards,
Tilen Držan