Over the last month I had extensive communications with the developer of the (premium) Anything Boxes section (in Pagelines store) (Adam Munns) and the developer of the WP Polylang Multilingual plugin (Frederic Demarle).
This was because the following problem occurred:
Anything Boxes showed all posts of two languages (Dutch and English) on the respective static frontpages for each language. It should of course have filtered posts for Dutch language on the Dutch frontpage and English on the English frontpage.
The solution to this problem was simple in the end. When duplicating a page for use in another language the settings for Anything Boxes were not copied to the new page and I should have set these settings manually again on the new page. I wasn't aware of this, but it makes sense. Because of this the pages didn't know how to differentiate between posts from different languages.
The dev of Polylang told me that Polylang is currently smart enough to synchronize metas like Featured images and page templates but it does not work out of the box with metas created by plugins and themes but (according to Frederic) it is rather easy to add them in the list using the filter 'pll_copy_post_metas'.
He mentions that he is not sure that these 'PageLines Meta Settings' are stored in post meta but that would make sense according to him. He asks if the Pagelines dev team will be interested to support this feature in the future.
I'm also wondering if you will consider adding Polylang translation support for manually editable strings like the 'Read more…' strings in Pagelines Settings.
Well that's of course up to you but I thought to let you know to be able to take this into consideration. I also post this for other users in case they experience the same kind of trouble and are looking for an answer.