If you outsource a translator, it means that you do hire someone directly to work as a translator. You give the job to another business, perhaps, that specially hires people as translators. Outsourcing is done for two reasons: 1. It is cheaper than hiring a person in your business 2. The job you want done isn't one for which you would must have a person hired at all times. You only need the job done a few times. Since you don't need that person all the time, it is cheaper just to pay somebody else outside for a short time to do it.

A translator who is brought in for jobs but not hired full time. They may also work for others.

Outsourcing is the purchase of goods or services from an outside source. For example: Italki is outsourcing the development of its chat service. This is because they are not developing their chat, they are actually hiring a 3rd-party company to get it done =)