make submit buttons primary and put them after save buttons for accessibility

lms/static/sass/course/base/_base.scss

@@ -91,6 +91,11 @@ button,
 .button {
   @extend .gray-button;
 
+  &.primary-button,
+  &.primary-button:hover {
+    @extend .primary-button;
+  }
+  
   form & {
     @extend .gray-button;
   }

lms/static/sass/course/base/_extends.scss

@@ -22,6 +22,12 @@ h1.top-header {
   font-size: em(13);
 }
 
+.primary-button {
+  @include button(simple, $link-color);
+  @extend .button-reset;
+  font-size: em(13);
+}
+
 .blue-button {
   @include button(simple, $blue);
   @extend .button-reset;

lms/templates/combinedopenended/openended/open_ended.html

@@ -31,7 +31,7 @@
 
   <div class="file-upload"></div>
   <input type="button" value="${_('Save')}" class="save-button" name="save"/>
-  <input type="button" value="${_('Submit')}" class="submit-button" name="show"/>
+  <input type="button" value="${_('Submit')}" class="submit-button primary-button" name="show"/>
   <input name="skip" class="skip-button" type="button" value="${_('Skip Post-Assessment')}"/>
 
   <div class="open-ended-action"></div>

lms/templates/combinedopenended/selfassessment/self_assessment_prompt.html

@@ -20,7 +20,7 @@
 
     <div class="file-upload"></div>
     <input type="button" value="${_('Save')}" class="save-button" name="save"/>
-    <input type="button" value="${_('Submit')}" class="submit-button" name="show"/>
+    <input type="button" value="${_('Submit')}" class="submit-button primary-button" name="show"/>
 
     <div class="open-ended-action"></div>
     <span id="answer_${id}"></span>

lms/templates/peer_grading/peer_grading_problem.html

@@ -71,7 +71,7 @@
                     </div>
                     <hr />
                     <div class="submission">
-                        <input type="button" value="${_("Submit")}" class="submit-button" name="show"/>
+                        <input type="button" value="${_("Submit")}" class="submit-button primary-button" name="show"/>
                     </div>
                 </div>
             </section>

lms/templates/problem.html

@@ -14,15 +14,15 @@
   <section class="action">
     <input type="hidden" name="problem_id" value="${ problem['name'] }" />
 
-    % if check_button:
-    <input class="check ${ check_button }" type="button" value="${ check_button }" />
-    % endif
     % if reset_button:
     <input class="reset" type="button" value="${_('Reset')}" />
     % endif
     % if save_button:
     <input class="save" type="button" value="${_('Save')}" />
     % endif
+    % if check_button:
+    <input class="check ${ check_button } primary-button" type="button" value="${ check_button }" />
+    % endif
     % if answer_available:
     <button class="show"><span class="show-label">${_('Show Answer(s)')}</span> <span class="sr">${_("(for question(s) above - adjacent to each field)")}</span></button>
     % endif