Enable fuzzy search?

[kod-kristoff]

Question is when it should be used.

If we enabled fuzzy search for all searches, all searches will be a lot noisier.
Add a flag (maybe ~) to the search string, requires explaining the semantics of that flag.

Add special rule for words that endswith <word>son, matches the regexp <word>s?son

Alternative:
Enable ? as regex, see #14

[kod-kristoff]

The editors can manually add a variant name.