If you want to build a successful website you need unique content. Period.
But even if you love writing, the sheer volume of content that needs to be produced can be an overwhelming task and that is where these next resources can really help you out...
Biggest and best translation business
These guys are the biggest and best in the translation business online. They use professional and experienced translators and translate to and from English in 34 different languages and I have seen turn-around time in as little as 24 hours.
A proofreader looking over your shoulder when you are typing
Most programs have a basic spell checker built in but beyond checking basic spelling they are all pretty limited... that is where Grammarly comes in. Gammarly is like having a proofreader looking over your shoulder when you are typing anywhere on your screen.