mediawiki: if...else if...else Statement

Change-Id: I3722aef2064e0878ac9a1b1f835d20f507f178af
Reviewed-on: https://gerrit.libreoffice.org/11299
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>