feat: Add internationalization (i18n) support (#182)

layouts/partials/search.html

@@ -1,7 +1,7 @@
 <div id="search-container">
   <div id="search-space">
-    <input autocomplete="off" id="search-bar" name="search" type="text" aria-label="Search"
-      placeholder="Search for something...">
+    <input autocomplete="off" id="search-bar" name="search" type="text" aria-label="{{ i18n "search" }}"
+      placeholder="{{ i18n "search_for_something" }}" dir="{{ $.Site.Language.LanguageDirection }}">
     <div id="results-container">
     </div>
   </div>