Get default_language value

[LN]

@wroos

default_language from the form settings should always dominate, even if different to the browser

This should be the case now. Setting a default language in Enketo - #10 by LN is where that change was made.

@wroos

Last line there is no more valid, as reference-table was removed

All of the same information is available in the template linked from that page. Do you see a way to make that clearer from the intro paragraph? Maybe it could say that the embedded reference table is now maintained in those documents.