Add missing "a" in soc/mail/welcome.html template. Fixes Issue 313.
Add missing "a" in soc/mail/welcome.html template. Fixes Issue 313.

Patch by: Pawel Solyga
Reviewed by: to-be-reviewed.

--HG--
extra : convert_revision : svn%3A32761e7d-7263-4528-b7be-7235b26367ec/trunk%402436

SRabbelier/Melange,SRabbelier/Melange,SRabbelier/Melange,SRabbelier/Melange,SRabbelier/Melange,SRabbelier/Melange,SRabbelier/Melange,SRabbelier/Melange,SRabbelier/Melange