Import of http://bugs.musicbrainz.org/ticket/1484

While the accented and special characters are now searchable in the instrument search, instruments that start with those characters are still quite hard to find. "è" is not equivalent to "e", and "Đ" is not equivalent to "d", for example, while they are in the standard MB search. That is confusing, and makes instruments as "Đing năm" or "èrhú" really hard to find for people who do not have those characters in their keyboards.