[dev] Not localized string

[Chuck Hagenbuch]

Quoting Federico Giannici <giannici@neomedia.it>:

> I'd remove the single quotes around the error message.
> I think the colon is sufficient and the quotes could make the error less
> readable...

Yeah, I agree. I was thinking of other messages where it's something like a 
mailbox name.

-chuck

--
Charles Hagenbuch, <chuck@horde.org>
"A dream which helps you to live your reality with dignity
 and justice is a good dream." - Tariq Ramadan