Update japanese/lookup to 1.99.96.20180209

• Update to 1.99.96.20130920.
• Switch master site to GitHub.
• Update LICENSE.
• Remove EMACS_FLAVORS_EXCLUDE because this version of Lookup can be built with editors/emacs-devel.
• Update description and WWW in pkg-descr.
• Add entry to UPDATING about incompatibility.

PR: 225748
Submitted by: yasu@utahime.org (maintainer)