The chat works like IM in Gmail. You can type messages to your contacts and groups directly from Translator Toolkit regarding questions you may have about a translation issue.
If you're not interested in using chat, you can turn it off in the Translator Toolkit settings.
Optimising Digital Marketing Campaigns with Search, Social and Analytics
At SES London (9-11 Feb) you'll get an overview of the latest tools, tips, and tactics in Paid, Owned, Earned, Integrated Media and Business Intelligence to streamline your marketing campaigns in 2015. Register by 31 October to take advantage of Early Bird Rates.