Thank you Violand for reporting this issue, and thank you BeckEbook and Doitsu with help tracking this issue down.
I have just pushed a fix to master for this issue that will appear in the next release.
Until that happens, there are two workarounds:
A. Make sure you change your default metadata language preference to exactly match your the dc:language tag in your book. For many epub developers who work in just one language this will be the case anyway.
or
B. Add the actual book language to the html tag of each xhtml file using the xml:lang and/or lang attributes.
Point B above is in general a good idea since using the lang attributes in epub3 and xml:lang attributes in epub2 makes it easier for html screen based accessibility readers who may not have access to the opf's setting to get things right.
Even with this fix, there may still be other places where the default language is not set properly so please post any other multi-language spellcheck issues here.
Thanks!
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