Add translations for the search box placeholder

Author: do-your-own-seo

source/_layouts/search.html

@@ -2,7 +2,7 @@
 layout: default
 ---
 <div id="search-container">
-<input type="text" id="query" placeholder="Search...">
+<input type="text" id="query" placeholder="{{page.title}}...">
 <ul id="output"></ul>
 </div>
 <script src="/assets/site-search.js" type="text/javascript"></script>