RC5 Bug? Compile to Word - can't change language from US English

When I compile to MS Word, the document ends up with US English as language. My default language in Word is Swedish (Sweden). When I open the Word document I cannot change the language, it changes back to US English when i try, and I can’t do spell check. (Especially annoying since the Swedish dictionary in Scrivener contains far too few words)

When I create a new document directly in Word, or open other documents, the language and spell check is Swedish.

I have quite an old version of Word, I think it is Word 2013, but it works well in all other cases.

Addition: I have now tried to compile to Word in Office 365, and the problem is no longer there - it was probably just a problem with Word 2013.