This is an outstanding collection translations of the N-400 by the The Immigrant Legal Resource Center (ILRC) and its partners. Note, check to see if each translation is based on the new version (3/26/2016) or the old version (9/13/13).
Here are translations of the N-400 by community-based partner organizations. There is also video translation of the 2/4/14 N-400 into Khmer available, courtesy of The Cambodian Family (www.cambodianfamily.org).
A step by step guide to completing the N-400 is available here.