[IMP] change name of view Quotation to Preview Quotationand also chnage position

[IMP] change inherit button
[IMP] website_quote : remove press edit button on template
Merge pull request #1383 from odoo-dev/master-quote-remove-editbutton-jas

[IMP] website_quote : remove "press edit button" on template
Merge pull request #1381 from odoo-dev/master-sale-quotation-button-rename-avo

[IMP] website_quote: rename and move 'view quotation' button
[IMP]website_quote: replace openerp by odoo in templates, improve quatation emptylist, improve mobile preview by css, add template empty list menutip.

[IMP]add quote_viewd field to check quote is viewed first time and change highlight button accordingly