Author: David Monllao
MDL-49280 auth: Rewording duplicate emails setting
From allowuserstoshareemailaddresses to allowaccountssameemail, also
changing lang strings.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=9502083292057684164b4593b60348b24af3f7a3
http://github.com/moodle/moodle/commit/9502083292057684164b4593b60348b24af3f7a3
+ 3.0 en [allowaccountssameemail,core_auth]
+ 3.0 en [allowaccountssameemail_desc,core_auth]
- 3.0 en [allowuserstoshareemailaddresses,core_auth]
- 3.0 en [allowuserstoshareemailaddresses_desc,core_auth]