Translation updates * mk (#6208) * sv (#6210)
Allow setting an issue's notes via params[:issue][:notes]. (XML API)
Refactor: extract ProjectsController#activity to a new Activities controller.
Refactor: extract common code to link_to_month.
Add the project_id to the Calendar link to month.
Refactor: extract target link generation.
Refactor: extract ternary operators to temps.
Refactor: extract link to previous and next month into helpers.
Refactor: convert many of the custom Issue routes to REST resources.
Refactor: extract method in bulk_update.
