Select list widget does not display user configured title or description

On a single-value select widget, the languagefield module does not use the user configured title or description for the field. It always has the title "Language" and description "Select a language.". This is confusing when you have more than one language field on the form, like I do.

In addition, for multi-value fields, the title and description text is repeated on each row, as well as in the wrapping container. The standard is to just display it on the container, and not on each individual widget row.

The attached patch addresses both of these issues.

Thanks.