Snowball Stemmers Based on the C 'libstemmer' UTF-8 Library
person("Milan", "Bouchet-Valat", email="nalimilan@club.fr",
                  role=c("aut", "cre"))
An R interface to the C 'libstemmer' library that implements
  Porter's word stemming algorithm for collapsing words to a common
  root to aid comparison of vocabulary. Currently supported languages are
  Arabic, Basque, Catalan, Danish, Dutch, English, Finnish, French, German, Greek,
  Hindi, Hungarian, Indonesian, Irish, Italian, Lithuanian, Nepali,
  Norwegian, Portuguese, Romanian, Russian, Spanish, Swedish, Tamil
  and Turkish.
Dr Martin Porter (2001) and Richard Boulton (2004, 2005) for
the 'libstemmer' C library, and Milan Bouchet-Valat (2013) for
the R package contents.