Fix icons when using RTL

src/theme/css/chrome.css

@@ -188,6 +188,10 @@ a > .hljs {
     left: var(--page-padding);
 }
 
+/* Use the correct buttons for RTL layouts*/
+[dir=rtl] .previous i.fa-angle-left:before {content:"\f105";}
+[dir=rtl] .next i.fa-angle-right:before { content:"\f104"; }
+
 @media only screen and (max-width: 1080px) {
     .nav-wide-wrapper { display: none; }
     .nav-wrapper { display: block; }