Add new pluralization rules for words ending 'f' that go to 'ves' to the default vocabulary.
Add new pluralization rules for words ending 'f' that go to 'ves' to the default vocabulary.

fixes #546

aloisdg/Humanizer,Flatlineato/Humanizer,MehdiK/Humanizer,Flatlineato/Humanizer,hazzik/Humanizer