Bug 32634: (follow-up) Restructure page headings

Bug 32634: (follow-up) Restructure page headings

An error in template logic is preventing the page's h1 from displaying.
Rather than fixing this I have changed the h1 to display a generic
"Transaction details" h1. The h2 shows the transaction type (credit or
debit).

The h2 is now inside the .page-section.

Signed-off-by: Magnus Enger <magnus@libriotech.no>
Checked all the places mentioned in the commit message, and they
all have .page-section now.
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>