How to find book titles in other languages?
Arguably the most complete resource would be the UNESCO's Index Translationum, a database of translation from 1979 onward. 

There you should be able to search more easily, selecting desired language and inputting a keyword from the title or an author. 

There is also a list of references hosted by Michigan State University's Library Guides, which offers a few hard-copy guides for consultation, however these are more restricted by field (mostly having to do with works of literature).