[IMP] im_chat: ESC shortcut to close chat window

Cherry-picked from 0172cfba76ae4509be33220f6d4ef09c005c8312
Closes #2335
[IMP] website_sale: clean categories

Cherry-picked from 61ed580876e88a34fbaab44863fe6f025cb94cda
Closes #134
[IMP] company name <> website name
[REM] website_blog : Remove all things related to blog.post.history model