You can try installing Java based application like Telenor Dictionary V2.0.0. But if you want Dictionary in SIS format try searching in mobile9 , mobiles24 or Google it.
But for those who don't have their own personal PC,the only solution for you to delete your hidden themes buried on your phone is to use a File Manager application,installed it,then you can find the the themes you wanna delete,i used Fexplorer.