In client.en.yml, add a comma after a leading sorry (PR #808)

Add a comma after the leading sorry to keep things consistent.

GitHub

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Just did

thanks

Yay! Thank you. On May 3, 2013 5:39 AM, “Sam” notifications@github.com wrote:

thanks

— Reply to this email directly or view it on GitHubhttps://github.com/discourse/discourse/pull/808#issuecomment-17388135 .