Add TODO: fix stresses on masculine suffixes
Refactor, extract string_without_[pre,suf]fix()

Simplify some word expansions with pre/suf-fix manipulators.
Refactor, use string_without_[pre,suf]fix()

Simplify some more word expansions with pre/suf-fix manipulators.
Noun-expand appropriate feminine nouns
Refactor, extract expanded_noun_util()

Make noun expansions easier to handle by extracting the common logic
between genders into a new helper function.