use deep_dup to prevent losing mail receiving options (#14491)

--HG--
extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4013457
pdf: define "general_pdf_fontname" at i18n yaml for multilingual environment (#13781)

Contributed by Jun NAITOH.

--HG--
extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4013458
Code cleanup, removed raw SQL queries.

--HG--
extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4013461
Fixed: German translation on "delete my account" page showing a "\n" (#18144).

--HG--
extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4013464
Fixed tests broken by r13461.

--HG--
extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4013466
Fixed test failure with SQLServer introduced by r13461.

--HG--
extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4013467
Fixed test failure with MySQL introduced by r13467.

--HG--
extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4013468
Updates for 2.6.0 release.

--HG--
extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4013471
Adds a Cancel button on issue edit view (#18051).

Patch by Marcin Świątkiewicz.

--HG--
extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4013477