Update enrollment terminology in ActivateLicensesModal, change enroll button color on disabled

app/templates/courses/activate-licenses-modal.jade

@@ -39,6 +39,10 @@ block modal-body-content
                 - var paid = user.get('coursePrepaidID')
                 input(type="checkbox", disabled=paid, checked=true, data-user-id=user.id, name='user')
                 span.spr= user.broadName()
+                if paid
+                  span (
+                  span already enrolled
+                  span )
 
         #error-alert.alert.alert-danger.hide
             
@@ -61,7 +65,7 @@ block modal-body-content
               | )
 
           p
-            button#activate-licenses-btn.btn.btn-success.text-uppercase(type="submit") Activate Licenses
+            button#activate-licenses-btn.btn.btn-success.text-uppercase(type="submit") Enroll Students
             
           p
             a#get-more-licenses-btn.btn.btn-info.text-uppercase(href="/courses/purchase") Get More Licenses

app/views/courses/ActivateLicensesModal.coffee

@@ -37,7 +37,7 @@ module.exports = class ActivateLicensesModal extends ModalView
     depleted = remaining < 0
     @$('#not-depleted-span').toggleClass('hide', depleted)
     @$('#depleted-span').toggleClass('hide', !depleted)
-    @$('#activate-licenses-btn').toggleClass('disabled', depleted)
+    @$('#activate-licenses-btn').toggleClass('disabled', depleted).toggleClass('btn-success', not depleted).toggleClass('btn-default', depleted)
     
   showProgress: ->
     @$('#submit-form-area').addClass('hide')