Bitcoin Core is the continuation of the original Bitcoin implementation (also called the Satoshi client) released by Satoshi Nakamoto in January 2009. Because nobody owns bitcoin (the software), it doesn't really make sense to talk about the "official" bitcoin software.

Having said that, Bitcoin Core is by far the most widely used implementation of bitcoin, so de facto you might call it official. Furthermore, Bitcoin Core is a full or thick client which downloads the entire blockchain, but there are also thin clients which only offer wallet services, such as Electrum or Mycelium.

Thank you Brennus101.
It appears Bitcoin Core is the original.  If it is open source, others could be made with slight changes such as language.

Electrum and Mycelium do not count if they do not download the entire blockchain, then they are depending on Bitcoin Core via a server that Mycelium and Electrum depend on to function.

Unless Electrum & Mycelium are operating via Blockchain.info API calls, to check the blockchain network.
They are light on hard drive space, allowing Mycelium to work on a phone... but that also makes it require Bitcoin Core via a server or website.  (Users will not need Bitcoin Core, but the alternative wallet software does)

So the root software is still English.
But this DOES provide Asian support.

It still makes Non English support a secondary priority to English.
So Asian markets are not first priority, thankfully.