Right now while previewing the certification template, the proper title is not
displayed on the tab of browsers.
This commit improves the behavior by adding name of the certification in title
so that use can see the proper string on browser tab. For doing so, we create
a new wrapper template that sets the title for the page, and use an iframe
to loads the pdf file from existing controlloer (which returns response for the
preview pdf).
Task ID-2341847
COM PR odoo/odoo#66028
Lavish Chhatwani
45eb2b397f