Arty2

That was indeed the field I was referring to in my previous comment.
Open Graph Locale could be also “translated” accordingly.
What is more, the publisher’s Twitter/Facebook/Google+ author username could also vary between languages.

Thanks for the reply; keep up the good work!

Related Polylang documentation can be found here:
https://polylang.wordpress.com/documentation/documentation-for-developers/functions-reference/#pll_register_string
The developer is also very active in the plugin’s support board.