[FIX] typo in odoo.py

Fixes #4203
[IMP] mail : add compose mail button on top menu to send private emails
[FIX] number of blogs by month according to blog/tags
[IMP] website.theme: close the modal when the user click outside or press escape
[ADD] website_slides: new module doing stuff. I swear.

Courtesy of a lot of people including Mantavya Gajjar(mga-odoo), Ravi Gadhia(rga-odoo),Vijay Patel(vip-odoo), Pariket Trivedi(ptr-odoo)
[REVIEW] Pre-merge review. This commit will have to
be squashed, but not before the end of the review process.