Hi, and thank you for your interest!
Budget Blitz is being translated using Weblate, a web tool designed to ease translating for both developers and translators.
Translation project for Budget Blitz currently contains 838 strings for translation and is being translated into 11 languages. Overall, these translations are 48.8% complete.
If you would like to contribute to translation of Budget Blitz, you need to register on this server.
Once you have activated your account just proceed to the translation section.