Hi Again,
Sorry for the issues you are having with the translations.
All our translations are provided by the community and provided as is we do not do them ourselves so sometimes there are issues and since this one has been broken for awhile it looks like this was missed.
And it uses the text domain for the WooCommerce Tickets Plugins and not WooCommerce itself so that is why WooCommerce does not translate it.
I do have some coding you can use to translate it yourself.
https://gist.github.com/jesseeproductions/48897101078d0ee74e69
Add that to your theme’s function.php and change Add to cart(Translate) to the text you would like it to be.
Let me know if that works.
Thanks