[Development] Another feature request for qdoc - multilanguage support

[liang.qi at nokia.com]

Hi, all,

Not every developer is good at English. Many of them would like to see the documentation in their own language.

David Boddie had done some work before, under qtdoc/doc/src, there are ja_JP and zh_CN directories. For separated doc files under qtdoc/doc/src, they could be translated into Japanese and Chinese. That works fine.

But for the API, the doc in each class, it doesn't work. There is a sub-task for that: 
https://bugreports.qt-project.org/browse/QTBUG-12919

I think we have 2 approaches to do that:

1. split the doc for api from the implementation file, for example qobject.cpp -> qobject.qdoc
2. use the script to extract the doc parts at first, then use qdoc to process them

Regards,
Liang