Hi all! (my first post at wp.org)
Polylang is a great plugin for multilingual sites - thanks for creating it! I'm doing the r&d work to allow my taxonomy names to get translated. I have found (and lost...) a page with a script for generating the "register taxonomy" function in such a way, I think, that the names of taxonomies were put into those __('') functions, to get translated. Do you think it is possible?
For SEO purposes, I think your plugin is great, as the slugs for taxonomies, posts, pages are translated / separate for each language.
But for the work to be complete, generated taxonomy names, labels, plurals, and other forms should also go to the .mo and .po files to be translated. Another plugin, xili-language claims to offer similar functionality, but I'm still testing if it really does the job.