Set the documents language #1179
Description
This issue was separated from #1177.
I would like to set the default language of the document. That language that is relevant for spell checking for example. By default it seems to be "en-US". First I thought it is in the file word/settings.xml where I find this tag <w:themeFontLang w:val="en-US" w:eastAsia="ja-JP"/>. But after some tests I would say that wasn't it.
Now after using grep on the xmlfiles I found <w:lang w:val="en-US" w:eastAsia="en-US" w:bidi="ar-SA"/> in word/styles.xml and word/stylesWithEffects.xml. This seems to be related to Document.styles.elements.
But investigating the existing elements I couldn't find the correct element. But for me that XML API is quite unusual and unpythonic. So It isn't easy for me investigating this. I can I find the correct element and modify it ?
I also tried doc.core_properties.language = 'de-DE' without effect on the documents language.