(refs #507)Small fix about pull request UI

src/main/twirl/pulls/compare.scala.html

@@ -45,7 +45,7 @@
     </div>
     @if(commits.nonEmpty && hasWritePermission){
       <div style="margin-bottom: 10px;" id="create-pull-request">
-        <a href="#" class="btn" id="show-form">Click to create a pull request for this comparison</a>
+        <a href="#" class="btn btn-success" id="show-form">Create pull request</a>
       </div>
       <div id="pull-request-form" class="box" style="display: none;">
           <div class="box-content">

src/main/twirl/pulls/mergecheck.scala.html

@@ -6,4 +6,4 @@
   <h4 style="color: #468847;">Able to merge</h4>
   <p>These branches can be automatically merged.</p>
 }
-<input type="submit" class="btn btn-success btn-block" value="Send pull request"/>
+<input type="submit" class="btn btn-success btn-block" value="Create pull request"/>