Work with E Commerce site From English to Spanish

Looking to take current English E Commerce site and convert Site to Spanish. We have product descriptions in Spanish From Spanish Version Catalog plus we can import Spanish product description already on another site. The issue is E commerce navigation info is in English. Program is all in English. We navidation info and words that customer sees to be put into Spanish. This can be coordinated with our webmaster that designed e commerce system but only speaks English. There are alot of things We are sure need clarification but we can discuss further.