Please cherry-pick:

Please cherry-pick:
- introduced new administrative action backing bean (add/update/delete being
  done here)
- land-line, fax and mobile instances must be intialized with null first, then
  check all respective backing bean properties if they all exist. This fixes
  the NPEs coming from updated constructors
- check Country instance against the interface Country and not not being null
- added missing i18n string

Signed-off-by: Roland Häder <roland@mxchange.org>