fix ad_image size hints. fix orbit backend controller error when changing language.

app/views/admin/ad_images/_form.html.erb

@@ -80,7 +80,7 @@
               <!--請程式務必將圖片尺寸加入到行內裡-->
               <%= image_tag @ad_image.file rescue ''%>
             </div>
-            <span class="alert widgetInfo">此區塊圖片尺寸請使用580px × 225px</span>
+            <span class="alert widgetInfo"><%= t("admin.ad.widget_info_for_ad_image_size",:best_size=> @ad_image.ad_banner.best_size) if !@ad_image.ad_banner.best_size.empty?%></span>
             <div class="controls file-upload input-prepend">
               <label class="control-label add-on btn" for="input-upload">
 								<%= t(:browse) %>