Milestone issues and pull requests (#5293)

* add milestone issues and pulls page instead of redirecting issues page

* add milestone when creating issue from milestone page

* refactor to merge similiar codes as a new function issues

* remove milestone info on milestone issues list

* fix missing params

options/locale/locale_en-US.ini

@@ -879,6 +879,7 @@ milestones.no_due_date = No due date
 milestones.open = Open
 milestones.close = Close
 milestones.new_subheader = Milestones organize issues and track progress.
+milestones.completeness = %d%% Completed
 milestones.create = Create Milestone
 milestones.title = Title
 milestones.desc = Description