Add projects tab stub to TeacherClassView

app/templates/courses/teacher-class-view.jade

@@ -122,6 +122,10 @@ block content
           li(class=(activeTab === "#enrollment-status-tab" ? 'active' : ''))
             a.course-progress-tab-btn(href='#enrollment-status-tab')
               .small-details.text-center(data-i18n='teacher.enrollment_status')
+          .tab-spacer
+          li(class=(activeTab === "#student-projects-tab" ? 'active' : ''))
+            a.course-progress-tab-btn(href='#student-projects-tab')
+              .small-details.text-center(data-i18n='') Projects
           .tab-filler
 
         .tab-content
@@ -129,8 +133,10 @@ block content
             +studentsTab
           else if activeTab === '#course-progress-tab'
             +courseProgressTab
-          else
+          else if activeTab === '#enrollment-status-tab'
             +enrollmentStatusTab
+          else
+            +studentProjectsTab
 
       else
         .text-center.m-t-5.m-b-5
@@ -430,3 +436,6 @@ mixin enrollmentStatusTab
           td.enroll-col
             if status !== 'enrolled'
               button.enroll-student-button.btn.btn-navy(data-i18n="teacher.enroll_student", data-user-id=student.id, data-event-action="Teachers Class Enrollment Enroll Student")
+
+mixin studentProjectsTab
+  p ...