quarantines: color code deliver and delete buttons

quarantines: color code deliver and delete buttons

In some languages, e.g. widely used English, "Delete" and "Deliver"
are looking rather similar without too much eye squinting required.

Add an accent on their icons using for, at least in the western
hemisphere, the respective associated color, like red for trash can.
To 1) avoid to much messing with those cultures that got it switched
and 2) some more common color blindness use blue for the delivery
button, just to make it stand out.

Keep the white/black list as is, as such accents work best if not
everything uses them, i.e., so that they more common options actually
stand out.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>