No Internet connection needed. Word Lens is a dictionary -- evolved. It looks up words for you, and shows them in context.
Word Lens has its limits. The translation will have mistakes, and may be hard to understand, but it usually gets the point across. It's designed for use on signs and menus, not books or newspaper articles. Word Lens does not read very stylized fonts, handwriting, or cursive. Try it, and tell us what you think!