[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.
No it doesn't work and I didn't diiscover why.

Please see links here below for similar issues:

http://stackoverflow.com/questions/9610518/pretty-print-in-etree-tostring-xml-python
https://bugs.launchpad.net/lxml/+bug/910018