Etiquette of continuing a game's sprite submissions

[Ton]

Barack nailed it. Feel free to build off of any existing rips. It's a community effort! But if you use their rips, just keep their names in the credits of your sheet. Nbd.
For translations, we generally go with the most commonly accepted one. For example, everything in Mother 3 is named after the fan translation. If you're not sure, you can always include the "official" untranslated name and the translated one, just to be sure. Hope this helped!