Rename general variable name isWritable to hasWritePermission.

src/main/twirl/wiki/page.scala.html

@@ -1,7 +1,7 @@
 @(pageName: String,
   page: service.WikiService.WikiPageInfo,
   repository: service.RepositoryService.RepositoryInfo,
-  isWritable: Boolean)(implicit context: app.Context)
+  hasWritePermission: Boolean)(implicit context: app.Context)
 @import context._
 @import view.helpers._
 @html.main(pageName + " - " + repository.owner + "/" + repository.name){
@@ -13,7 +13,7 @@
     </li>
     <li class="pull-right">
       <div class="btn-group">
-        @if(isWritable){
+        @if(hasWritePermission){
           <a class="btn" href="@url(repository)/wiki/_new">New Page</a>
           <a class="btn" href="@url(repository)/wiki/@pageName/_edit">Edit Page</a>
         }