Fix: Use the current locale for CTCP-Time replies.

CTCP Time is supposed to return the local time of the client,
not the GMT time which [[NSDate date] description] returns.

https://en.wikipedia.org/wiki/Client-to-client_protocol#Common_CTCP_Commands

Before:

    2013-01-10 19:02:50 +0000

After:

    Thursday, January 10, 2013 7:02:50 PM Central European Time