Hi, I convert the epub to docx and then back to epub to check whether the Language metadata is preserved.
My original epub file has the following Language metadata:
<dc:language xmlns:dcterms="http://purl.org/dc/terms/" xmlns:dtb="http://www.daisy.org/z3986/2005/dtbook/" xmlns:d="http://www.daisy.org/ns/pipeline/data" id="language_1">en</dc:language>
Then I convert the epub to docx and then back to epub to check whether the Language metadata is preserved, but now it is changed from "en" to "nb":
<dc:language>nb</dc:language>
This is an English Learning book so it is essential that the spoken Language is indeed English in the docx.
In the text glossary the Language is preserved e.g.
<p>Page 221:</p><dl><dt>completely: </dt><dd lang="no" xml:lang="no">fullstendig</dd><dt>out of fashion: </dt><dd lang="no" xml:lang="no">ikke på moten</dd>
Konvertert tilbake til epub fra docx:
<p class="block_6"><span class="text_">Page 221:</span></p>
<ul class="list_">
<li class="block_9"><span class="text_">completely: </span><span lang="no" class="text_">fullstendig</span></li>
So it seems that the main language "en" is lost converting to docx.