Fix styling and link to exercise

app/assets/stylesheets/exercises.css.scss

@@ -95,6 +95,23 @@ a.file-heading {
   left: 0;
 }
 
+.feedback-page {
+  .header {
+    font-weight: bold;
+    margin-bottom: 10px;
+  }
+
+  .value {
+    border: 1px solid grey;
+    padding: 10px;
+    margin-bottom: 10px;
+  }
+
+  .no-feedback {
+    font-weight: bold;
+    margin-top: 50px;
+  }
+
   .feedback-header {
     display: flex;
 
@@ -117,3 +134,4 @@ a.file-heading {
       font-weight: bold;
     }
   }
+}

app/views/exercises/feedback.html.slim

@@ -1,6 +1,10 @@
-h1 = link_to(@exercise)
-= row(label: 'exercise.description', value: render_markdown(@exercise.description))
+h1 = link_to(@exercise, exercise_path(@exercise))
 
+.feedback-page
+  .header = t('activerecord.attributes.exercise.description')
+  .value = render_markdown(@exercise.description)
+
+  .header = t('activerecord.models.user_exercise_feedback.other')
   - if @feedbacks.nil? or @feedbacks.size == 0
     .no-feedback = t('user_exercise_feedback.no_feedback')