webadmin: new host->password

- For German, Chinese and Korean locales the password
  field contained a character when adding a new host.
  This is due to the translation of 'empty' constant for
  some reason contained a space instead of being empty.
  In a subsequent patch we will look into replacing the
  translation constant with an actual blank. For now we
  just fix the translation file.

Change-Id: I74825b031d24e901e46f90bfbff6423c56442802
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1168125
Signed-off-by: Alexander Wels <awels@redhat.com>