Update jquery.uls and adapt styling

jquery.uls.compact module is kept for now as some other
extensions depend on it. But it does not do anything
anymore.

There are some styles which should be in jquery.uls
upstream, but given the current state that is easiest
done in a follow-up later.

The main change is that language selection is now
compact by default: no heading etc.

Includes style changes for the dialogs, and especially
for the new position of the callout caret.

Bug: T85519
Change-Id: Iade8005439b4f58ab241752f69a5365d8bb88d2c

resources/images/back-grey-ltr.svg

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" id="Layer_1">
+    <path d="M7 13.1l8.9 8.9c.8-.8.8-2 0-2.8l-6.1-6.1 6-6.1c.8-.8.8-2 0-2.8L7 13.1z" id="path3" fill="#555"/>
+</svg>

resources/images/back-grey-rtl.svg

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" id="Layer_1">
+    <path d="M7 4c-.8.8-.8 2.2 0 3l6 6-6 6c-.8.8-.8 2.2 0 3l9-9-9-9z" id="path3" fill="#555"/>
+</svg>

resources/images/close.svg

@@ -0,0 +1 @@
+<?xml version="1.0" encoding="UTF-8"?><svg xmlns="http://www.w3.org/2000/svg" width="13.592" height="13.592"><g transform="translate(-578.659 -309.301)" fill="#555"><rect width="3.204" height="16.018" x="188.862" y="629.484" transform="rotate(-45)"/><rect width="3.204" height="16.018" x="-639.095" y="182.455" transform="matrix(-.707 -.707 .707 -.707 0 0)"/></g></svg>