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Writer ODText: Write the language of a text run (#2944)

* Writer ODText: Write the language of a text run

The language of a text run was dropped, so a screen reader read a run in
another language with the voice of the document language. The document
language itself fell back to fr-FR, zh-CN and hi-IN when none was set,
and a tag was split on '-' into a language and a country only, which broke
on a tag with a script such as sr-Latn-RS.

A run now carries its languages as fo:language, style:language-asian and
style:language-complex. A BCP 47 tag is written as its language, script
and country, with style:rfc-language-tag when it has a script, a variant
or an extension, as LibreOffice writes it. A document without a language
is en-US, as the Word2007 writer makes it, and an unset East Asian or
complex language is left out. hideGrammaticalErrors and noProof still
write zxx.

* Changelog: link #2944

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