Updated mediawiki/extensions
Project: mediawiki/extensions/WikiLexicalData  def04478f6347066286037c8706e337c81e30f74

Special Datasearch
* added prev / next buttons
* disable external id search for now
* rewrote a few queries according to code conventions
* simplified variable names

Change-Id: I187cea76328f89536e4d051059a13c91f338b974