The multilingual support started.
The latest 2.x-dev release now handles restoring the language when coming back from the winbank redirect.
It has been tested and works on a single language website with no problems but has not been tested on an actual multilingual site.
The multilingual handling is also very simplistic assuming that language is prefixed on the URL and will probably need improvements.
Active
2.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
@GiorgosK, I have provided a new version for the module and released 2.0.0. I also changed the way the module stores the language of the current page. It should still play fine but I haven't really tested this in a multilingual website.