tigefa Redmine

remove trailing tabs from app/controllers/admin_controller.rb

remove trailing tabs from app/models/project.rb

remove trailing tab from app/helpers/custom_fields_helper.rb

remove trailing tab and white-spaces from app/controllers/issue_statuses_controller.rb

Adds Issue#status_was that returns the initial issue status.

Adds closed_on to issues API responses (#824).

Make sure that fields filled before tracker change are preserved.

Russian "label_last_n_weeks" translation changed by Mikhail Velkin (#12645)

Russian "label_x_issues" translation changed by Mikhail Velkin (#12645)

Bulgarian translation changed and updated by Ivan Cenov (#13190)