Board Thread:Wiki Discussion/@comment-25761472-20141125014215/@comment-99.235.152.244-20141125023004

When installing the Vocaloid3 editor there is a option of choosing what language to install the interface in.

Also when using a Japanese vocaloid, you can enter romaji as well.

However I do not recommend buying a vocaloid in a language you are not fluent in. For example; I own a few English vocaloids, and a lot of work is needed to be put in just for pronunciation to achieve realism, which a non-fluent/native speaker would not catch easily.