default theme clean & replace install data

public/blog/themes/nav_fixed/post.html

@@ -58,10 +58,10 @@
 			
 		    <div class="pre-next-post">
 		        <p>
-			    Pre: {{if $.prePost}}<a href="{{$.postUrl}}/{{$.prePost.UrlTitle}}">{{$.prePost.Title}}</a>{{else}}无{{end}}
+			    Pre: {{if $.prePost}}<a href="{{$.postUrl}}/{{$.prePost.UrlTitle}}">{{$.prePost.Title}}</a>{{else}}No Post{{end}}
                 </p>
                 <p>
-                Next: {{if $.nextPost}}<a href="{{$.postUrl}}/{{$.nextPost.UrlTitle}}">{{$.nextPost.Title}}</a>{{else}}无{{end}}
+                Next: {{if $.nextPost}}<a href="{{$.postUrl}}/{{$.nextPost.UrlTitle}}">{{$.nextPost.Title}}</a>{{else}}No Post{{end}}
 			    </p>
 			</div>