It depends on how accurate he wants to be and how much interpretation he plans to do (from the garbled English). For example, from textbook sentences like それは私の人生における最良の日であった you get "As for that it was the best day in my life." Not bad, not perfect. Then you try something like その話題に関係する代表的なものをとりあげる時に使う you get "When picking up typical ones which are related to the topic, you use." Still, do-able, maybe. When you start throwing in non-standtard Japanese phrases (dialects, common usages that are grammatically wrong) you run into trouble.
For example こじゃんとうまい (very tasty, Tosa-ben) is "It is densely will not question" わたくしは京子どす (My name is Kyoko,
Kyoto-ben) is "I do the Kiyouko ど" and lastly for today, まいど、おおきに (basically, "Thanks a lot, please come again" Kansai-ben) gives us "The ど will not, it makes large makes large."
I hope you can see why these online things might be useful for getting a handle on textbook phrases, but not on other things. It is always best to have translations of things like comics, songs, poems done by a person. A machine cannot pass along subtle meanings or linguistic variations.
Koganei, I hope you find someone to help you. Sounds like you have a fun project ahead of you