use row-fluid class instead of row for full-width layout.

src/main/twirl/gitbucket/core/issues/create.scala.html

@@ -8,7 +8,7 @@
 @html.main(s"New Issue - ${repository.owner}/${repository.name}", Some(repository)){
   @html.menu("issues", repository){
     <form action="@url(repository)/issues/new" method="POST" validate="true" class="form-group">
-      <div class="row">
+      <div class="row-fluid">
         <div class="col-md-9">
           <span id="error-title" class="error"></span>
           <input type="text" id="issue-title" name="title" class="form-control" value="" placeholder="Title" style="margin-bottom: 6px;" autofocus/>

src/main/twirl/gitbucket/core/issues/issue.scala.html

@@ -46,7 +46,7 @@
       </span>
     </div>
     <hr>
-    <div class="row" style="margin-top: 15px;">
+    <div class="row-fluid" style="margin-top: 15px;">
       <div class="col-md-9">
         @commentlist(Some(issue), comments, hasWritePermission, repository)
         @commentform(issue, true, hasWritePermission, repository)