Closes MarkUsProject#386. Add space between average and percentage sign.

We'd like to have a space between % sign and the computed average for
the French locale. The English locale should not have this space. Now
the average is passed in as a parameter and the % sign is also in the
locale file.

app/views/main/_assignment_info_summary.html.erb

@@ -7,10 +7,7 @@
 
 <table>
   <tr>
-    <td><%= I18n.t(:assignment_average) %></td>
-    <td>
-      <%= h("#{assignment.results_average || '0'}") %>%
-    </td>
+    <td><%= I18n.t(:assignment_average, :results_average => h(assignment.results_average || '0')) %></td>
   </tr>
 
   <tr>

config/locales/en.yml

@@ -1106,7 +1106,8 @@ en:
     account_disabled: "This account has been disabled"
 
     #app/views/main/_assignment_info_summary.erb
-    assignment_average:        "Assignment Average:"
+
+    assignment_average:        "Assignment Average: %{results_average}%"
     assignments_submitted:     "Assignments Submitted:"
     assignments_graded:        "Assignments Graded:"
     refresh_graph:             "Refresh the graph"

config/locales/fr.yml

@@ -1078,7 +1078,7 @@ fr:
     account_disabled: "Ce compte a été désactivé"
 
     #app/views/main/_assignment_info_summary.erb
-    assignment_average:        "Moyenne :"
+    assignment_average:        "Moyenne : %{results_average} %"
     assignments_submitted:     "Projets envoyés :"
     assignments_graded:        "Projets corrigés :"
     refresh_graph:             "Actualiser le graphique"