Fix some small positioning/overflow things

* Echo icon positioning fix in rtl languages (thanks to RoanKattouw)
* Fix for header lines overlapping with floats (thanks to someone who...
  I don't actually remember, but they're absolutely lovely too)

Change-Id: I57825a7e7e06184f452cec69b15b484173b59413

resources/extensions/Echo.less

@@ -13,6 +13,7 @@
 	#personal-extra {
 		// Position and keep it from randomly overflowing massively for no apparent reason
 		margin: 0.7em 0 -2em 0;
+		white-space: nowrap;
 
 		ul {
 			list-style: none;

resources/screen-common.less

@@ -23,7 +23,6 @@ div {
 	.box;
 	background: @background;
 	padding: 1em @content-padding 3em;
-	overflow: auto;
 	position: relative;
 }
 #mw-content-container {
@@ -309,7 +308,7 @@ a.new,
 	h1,
 	h2 {
 		border-bottom: solid 2px @blue;
-
+		overflow: hidden;
 	}
 
 	h1.firstHeading {