I hope that the plugin gets translated into as many languages as possible, and therefore I offer 1 lifetime Pro license for every set of translation.
This means that you get 1 lifetime Pro license for a complete translation of these (1 license per item):
The translatable texts (strings) can be seen here: https://translate.wordpress.org/projects/wp-plugins/shared-files/
If your language has no translations yet, then the readme should be translated first.