3.4 alpha pre-release (3.3.9.0)

This is what most likely to be 3.4.
Need to finish documentation, draft of which you may read to suggest improvements:

More or less finished:
https://qtranslatexteam.wordpress.com/integration/
https://qtranslatexteam.wordpress.com/multilingual-fields/

Drafts to be finished:
https://qtranslatexteam.wordpress.com/json-configuration-syntax/
https://qtranslatexteam.wordpress.com/java-scripts/
https://qtranslatexteam.wordpress.com/interface/

Main plugin description also changed:
https://github.com/qTranslate-Team/qtranslate-x