Adds HTML title elements to templates that extend either `base.html`,
`portico.html` or `portico_signup.html`, and that are not website
portico landing pages that will use the `PAGE_TITLE` variable to set
the HTML title element (see following commit in series).
Also, updates some templates for missing translation tags.
As a general rule, we want the title element (and page content)
translated. Exceptions that are updated in this commit are templates
used in the development environment, analytics templates that are used
by staff and templates related to Zephyr.
This commit adds a header above the plain text view of the digest to
be more clear about what the user is seeing.
A bit hacky, but the page is an internal development tool.
Fixes#21165.
This adds a proper template for the /digest page, making it a
reasonable way to view the digest email content for development and
debugging.
Fixes: #11016.
Lauryn Menard
nickgiann
Anders Kaseorg
Anders Kaseorg
Puneeth Chaganti
Shoumorup