they might not have what you're looking for but you'll probably need something similar to one of the data sets they have.
Most systems now are trained on parallel corpuses, for instance there is a collection of 30,000 sentences in English and Japanese listed on that site. If you've got enough training examples you don't need a dictionary, a specification of the grammar or anything else. You need a lot of text though.
Comments
See here for some machine translation training data sets
https://metatext.io/datasets-list/translation-task
they might not have what you're looking for but you'll probably need something similar to one of the data sets they have.
Most systems now are trained on parallel corpuses, for instance there is a collection of 30,000 sentences in English and Japanese listed on that site. If you've got enough training examples you don't need a dictionary, a specification of the grammar or anything else. You need a lot of text though.