BibRank: self cites upgrade recipe improvement

* Splits the statements that create SQL tables in 3 different
  run_sql() calls, so that we do not fail any more when the tables
  are already created.  (closes #1482)

Reviewed-by: Samuele Kaplun <samuele.kaplun@cern.ch>
WebSearch: Greek translation of Search Guide

Co-authored-by: Evangelos Savvidis <vsavidis@gmail.com>
Reviewed-by: Tibor Simko <tibor.simko@cern.ch>
Merge branch 'master' into next

* master:
  WebSearch: Greek translation of Search Guide
  BibRank: self cites upgrade recipe improvement