Bug 34408: Inconsistencies in SMTP servers page titles, breadcrumbs, and header

Bug 34408: Inconsistencies in SMTP servers page titles, breadcrumbs, and header

This patch updates the SMTP servers administration page in order to make
the page title, breadcrumb navigation, and page headings consistent with
each other.

The patch also adds a space between the delete button icon and the text.

To test apply the patch and go to Administration -> SMTP servers.

- Confirm that the page header, breadcrumb navigation, and page headings
  are consistent on each view of the page:
  - Main page
  - New SMTP server
  - Edit SMTP server

Signed-off-by: Pedro Amorim <pedro.amorim@ptfs-europe.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>