Add option to remove diminutive versions

[mrfatguy]

Following #12. Add a button to remove all diminutive, short or alternative pronunciation versions from the list.

This should be implemented by iterating array and for items that includes ( and ) characters removing everything inside (plus these characters themselves plus space between name and opening parathesis).

Since we want to store currently generated list of names in localStorage (#4) it can be considered to implement another (#14) checkbox instead of button (as suggested above) and allow user to hide and show back all alternative pronunciations.