Examples of languages
English translation - English translator
One of the first languages that you should translate your site into, is English. English is THE international language, and one of the most used languages on the internet. Nearly a quarter of the world's population speaks English, starting with the UK, Ireland, North America, Canada, Australia, New Zealand but also South Africa, India, Singapore etc.. not to mention the countries where English is an important language as Hong Kong, Scandinavia etc..
Only with the UK, you are already targeting an e-commerce market of 96 billion euros of turnover in 2012 (source: the FEVAD).
The globalization of your site begins with its translation into English!
Association ecommece Europe et GfK
Etude Fevad / LSA sur le moral des e-commerçants, mars 2013