Small fix to HTML title.
Add mail field to admin user search filter (#3882).
Adds a test for attached image inside a link (#4033).
Sets proper content type for plain text mails (#3970).
Reverts r2770 (#3391).
Sets the current project as the default value of project jump box (#4053).
Translation updates (closes #4054, #4060, #4075).
Prevent undefined method `<=>' for nil:NilClass in AbstractAdapter (#4098).
Fixes form buttons on projects/settings/activities (closes #4083).
Remove hard coded string in a view (closes #4076).
