[8.0] Help online: new features

This PR add new features on help online module:

- import and export pages
- autobackup before update
- own menu
- record rules
- french translation

Note: Travis fails due to flake 8 issues on modules web_easy_switch_company and web_export_view.
It's a PEP convention: http://legacy.python.org/dev/peps/pep-0257/#multi-line-docstring ...