How can I know if that font support this language or not

Hi all,

This is question may be simple for the others but really it is annoying me. and I want to get a final answer about it in my mind with a specified  answer.

here is my problem How can I know if some font (X) support some language (Y) or not.

for example: I am working now on Albanian text, It is seems that it contain Latin character BUT it contain some special characters like "ë, ç and so on...". and i want to use a Helvetica or frutiger font. here is my problem How I can be sure that Helvetica/ frutiger support this languages.

may be there is site for complete information about fonts which give me a whole details about fonts like a font name and language use with this font or something else.

I hope my question be clear and please excuse me if there is any misunderstand for my bad languages

Thanks in advance

Hima