I wrote a modified version of the Simple Contact plugin that has multilanguage support and google reCAPTCHA validation in the contact form. So far I have English, Italian and Spanish versions but I would like to add some more to the languages.yaml file.
So if anyone wants to help me translate those you can either fork it and pull request or send me the translations here. I would be most grateful. 
I am also open to any suggestions you might have for improving the code since my programming skills in PHP and twig are a bit lacking 
.