Hi, and thank you for your interest!
TransforMap Viewer is being translated using Weblate, a web tool designed to ease translating for both developers and translators.
Translation project for TransforMap Viewer currently contains 14 strings for translation and is being translated into 23 languages. Overall, these translations are 59.3% complete.
If you would like to contribute to translation of TransforMap Viewer, you need to register on this server.
Once you have activated your account just proceed to the translation section.