Code cleanup, removed raw SQL queries.

git-svn-id: http://svn.redmine.org/redmine/trunk@13461 e93f8b46-1217-0410-a6f0-8f06a7374b81
Fixed: German translation on "delete my account" page showing a "\n" (#18144).

git-svn-id: http://svn.redmine.org/redmine/trunk@13464 e93f8b46-1217-0410-a6f0-8f06a7374b81
Fixed tests broken by r13461.

git-svn-id: http://svn.redmine.org/redmine/trunk@13466 e93f8b46-1217-0410-a6f0-8f06a7374b81