The stem function takes a scalar as a parameter and stems the word
according to Martin Porters Danish stemming algorithm, which can be found
at the Snowball website: http://snowball.tartarus.org/.

It also supports caching if the use_cache option is passed when
constructing a new L:S:S:D object.

Homepage:
https://metacpan.org/release/Lingua-Stem-Snowball-Da
