Dict.cc is a powerful dictionary with more than 50 different languages that works even if you're not connected to the Internet. All you have to do is download the dictionaries you want to use, and then they'll always be available for you.
With Dict.cc, you can find dictionaries in English and German for the following languages: Albanian, Bosnian, Bulgarian, Croatian, Czech, Danish, Dutch, Esperanto, Finnish, French, Greek, Hungarian, Icelandic, Italian, Latin, Norwegian, Polish, Portuguese, Romanian, Russian, Serbian, Slovak, Spanish, Swedish, and Turkish. All you have to do is download them directly to your smartphone's memory.
Dict.cc is an easy-to-use dictionary with lots of features and tons of languages that takes up very little space. Of course, how much space it takes up depends on how many additional dictionaries you download to use offline.