Refactor: move method, ProjectsController#list_files to FilesController#index.
Refactor: move method, ProjectsController#roadmap to VersionsController#index.
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.
