Do not hardcode strings.

Signed-off-by: KhasMek <Boushh@gmail.com>
Pairing: show correct hint for PIN field

Signed-off-by: KhasMek <Boushh@gmail.com>
Smarter inflation of layout

  Using null in this instance isn't recommended
  as it will drop everything from the parents
  formatting.

Signed-off-by: KhasMek <Boushh@gmail.com>
center dialog layout

Signed-off-by: KhasMek <Boushh@gmail.com>