Made the input field of the page consistent with
the other similar pages. Here are I have done the following things:
1. Changed text 'Enter your organization's Zulip URL:'->'Organization URL'.
2. Left aligned the label and button to make it consistent.
3. Moved 'Don't know your organization URL? Find your organization.' to be
just below the URL field.
4. Changed the placeholder 'your-organization-url' -> 'your-organization'
Fixes#32198
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.
We fixed the main issue of this form in CVE-2020-9444, but the audit
done at that time only included links found in rendered_markdown; this
change completes our audit for links with target=_blank anywhere in
the codebase.
