Board Thread:Questions and Answers/@comment-32390618-20180219213238/@comment-3212706-20180219214332

Yes, the ones you find online are unofficial fan translations, unless you're reading on Viz.com.

Translating isn't a simple process so there are bound to be variations. Some groups play up the cursing, while Viz has been known to censor dialogue. "Aster" is from before the actual spelling was known, and one of the groups kept using it and other misspellings far longer than they should've.