Minor changes to instructor Analytics tab

lms/static/sass/course/instructor/_instructor_2.scss

@@ -543,7 +543,7 @@ section.instructor-dashboard-content-2 {
 
   .last-updated {
     line-height: 2.2em;
-    @include font-size(10);
+    @include font-size(12);
   }
 
   .display-graph .graph-placeholder {

lms/templates/courseware/instructor_dashboard.html

@@ -603,7 +603,7 @@ function goto( mode)
 
   %if analytics_results.get("StudentsEnrolled"):
     <p>
-      ${_("Students enrolled:")}
+      ${_("Students enrolled (historical count, includes those who have since unenrolled):")}
       ${analytics_results["StudentsEnrolled"]['data'][0]['students']}
       (${analytics_results["StudentsEnrolled"]['time']})
     </p>

lms/templates/instructor/instructor_dashboard_2/analytics.html

@@ -19,6 +19,9 @@
   <div class="grade-distributions-widget">
     <div class="header">
       <h2 class="title"> ${_("Grade Distribution")} </h2>
+      <p>${_("The chart below displays the score distribution for each standard problem in your class, specified by the problem's url name.")}
+	${_("Scores are shown without weighting applied, so if your problem contains 2 questions, it will display has having a total of 2 points.")}</p>
+      <br />
       ${_("Problem")}: <select class="problem-selector">
         <option> ${_("Loading problem list...")} </option>
       </select>
@@ -34,7 +37,8 @@
 
 <div class="grade-distributions-widget-container"
   data-endpoint="${ section_data['proxy_legacy_analytics_url'] }"
-></div>
+>
+</div>
 
 <div class="profile-distribution-widget-container"
   data-title="${_("Year of Birth")}"