Trying to make the Find & Replace dialog a bit more compact

Especially with long translations, the removal of homogeneous-width
columns make the dialog’s size more manageable.
Fixed capitalization, indentation, and made the dialog non-resizable to
remove the Maximize button under Compiz/GNOME and the fat border under
XP. The expander will still work.

Change-Id: I2fb820ac406afe45a3d5339f574c13902ad48753
Reviewed-on: https://gerrit.libreoffice.org/11942
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>