RTL languages support in reader (#494)

The text direction for RTL languages is wrong in reader view.

The `dir=auto` attribute will solve this for most cases, for items with a title that starts with RTL language.

pages/reader/reader.js

@@ -45,6 +45,7 @@ function getPreviewHTML({ items }) {
   for (const item of items) {
     const itemContainer = document.createElement("div");
     itemContainer.classList = "item";
+    itemContainer.dir = "auto";
 
     const anchor = item.url ? document.createElement("a") :
       document.createElement("strong");