How to query the custom fields by language?

In qTranslate, there is this function that “dispatch” the language with the kind of string you have.

Haven’t tested it yet, but you could do something like:

$myString = get_post_meta( $post_id, 'Functions', true);
echo qtrans_useCurrentLanguageIfNotFoundUseDefaultLanguage($myMeta);

This will display the right language on your post based on the current page’s language.