Bug 28902: Grey color on label for record metadata

Bug 28902: Grey color on label for record metadata

Actually looking at a record search or details, we see a black label
(for example "Author:") and a grey metadata (for example "J.R.R Tolkien").

Seems bad for accessibility.
In my opinion the most important to see is the metadata not the label.

It is possible to change with a custom CSS but I open this report to
propose to change default display.

Test plan :
1) Apply patch and build CSS in OPAC and staff interface
2) Search for any record in OPAC/Staff interface
3) You see grey label and black metadata

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>