Including foreign characters in image titles and descriptions

I'm having trouble including foreign letters in image titles and descriptions. Specifically, I want to allow `þ` (þ), `ð` (ð), and `æ` (æ), but I haven't got the first idea how to go about it, and a search turned up nothing helpful.

Will somebody please tell me how I'm supposed to enter these letters into ZenPhoto? Nothing I've tried has worked.
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