Git commits in Moodle 2.8.3 by Vadim Dvorovenko

commit a8808ad7bad21cb11617937e3feec8672cb15d61
Author: Vadim Dvorovenko <Vadimon@mail.ru>
Date:   Thu, 15 Jan 2015 01:49:52 +0800
Tag:    v2.8.3

MDL-42172 Authentification: Adding alternate names to "Lock user fields"

commit 5e25d5630b2958214583ba17a924f4d3d4e74038
Author: Vadim Dvorovenko <Vadimon@mail.ru>
Date:   Thu, 15 Jan 2015 01:07:38 +0800
Tag:    v2.8.3

MDL-48798 Statistics: Adding lang string for user activity.

commit ad2c1a2156af43e9c870a885b837c5834ce476ae
Author: Vadim Dvorovenko <Vadimon@mail.ru>
Date:   Thu, 15 Jan 2015 00:39:14 +0800
Tag:    v2.8.3

MDL-48779 MNet: multibyte substr in certificate generation