Index: src/wp-includes/js/quicktags.js
===================================================================
--- src/wp-includes/js/quicktags.js	(revision 31608)
+++ src/wp-includes/js/quicktags.js	(working copy)
@@ -330,11 +330,12 @@
 	 * @param string arg2 Optional. Ending tag like "</span>"
 	 * @param string access_key Deprecated Not used
 	 * @param string title Optional. Button's title="..."
+	 * @param string ariaLabel Optional. Button's aria-label="..."
 	 * @param int priority Optional. Number representing the desired position of the button in the toolbar. 1 - 9 = first, 11 - 19 = second, 21 - 29 = third, etc.
 	 * @param string instance Optional. Limit the button to a specific instance of Quicktags, add to all instances if not present.
 	 * @return mixed null or the button object that is needed for back-compat.
 	 */
-	qt.addButton = function( id, display, arg1, arg2, access_key, title, priority, instance ) {
+	qt.addButton = function( id, display, arg1, arg2, access_key, title, ariaLabel, priority, instance ) {
 		var btn;
 
 		if ( !id || !display ) {
@@ -345,10 +346,10 @@
 		arg2 = arg2 || '';
 
 		if ( typeof(arg1) === 'function' ) {
-			btn = new qt.Button(id, display, access_key, title, instance);
+			btn = new qt.Button(id, display, access_key, title, ariaLabel, instance);
 			btn.callback = arg1;
 		} else if ( typeof(arg1) === 'string' ) {
-			btn = new qt.TagButton(id, display, arg1, arg2, access_key, title, instance);
+			btn = new qt.TagButton(id, display, arg1, arg2, access_key, title, ariaLabel, instance);
 		} else {
 			return;
 		}
@@ -404,36 +405,38 @@
 	};
 
 	// a plain, dumb button
-	qt.Button = function(id, display, access, title, instance) {
+	qt.Button = function(id, display, access, title, ariaLabel, instance) {
 		var t = this;
 		t.id = id;
 		t.display = display;
 		t.access = '';
 		t.title = title || '';
+		t.ariaLabel = ariaLabel || '';
 		t.instance = instance || '';
 	};
 	qt.Button.prototype.html = function(idPrefix) {
 		var title = this.title ? ' title="' + this.title + '"' : '',
+			ariaLabel = this.ariaLabel ? ' aria-label="' + this.ariaLabel + '"' : '',
 			active, on, wp,
 			dfw = ( wp = window.wp ) && wp.editor && wp.editor.dfw;
 
 		if ( this.id === 'fullscreen' ) {
-			return '<button type="button" id="' + idPrefix + this.id + '" class="ed_button qt-dfw qt-fullscreen"' + title + '></button>';
+			return '<button type="button" id="' + idPrefix + this.id + '" class="ed_button qt-dfw qt-fullscreen"' + title + ariaLabel + '></button>';
 		} else if ( this.id === 'dfw' ) {
 			active = dfw && dfw.isActive() ? '' : ' disabled="disabled"';
 			on = dfw && dfw.isOn() ? ' active' : '';
 
-			return '<button type="button" id="' + idPrefix + this.id + '" class="ed_button qt-dfw' + on + '"' + title + active + '></button>';
+			return '<button type="button" id="' + idPrefix + this.id + '" class="ed_button qt-dfw' + on + '"' + title + ariaLabel + active + '></button>';
 		}
 
-		return '<input type="button" id="' + idPrefix + this.id + '" class="ed_button button button-small"' + title + ' value="' + this.display + '" />';
+		return '<input type="button" id="' + idPrefix + this.id + '" class="ed_button button button-small"' + title + ariaLabel + ' value="' + this.display + '" />';
 	};
 	qt.Button.prototype.callback = function(){};
 
 	// a button that inserts HTML tag
-	qt.TagButton = function(id, display, tagStart, tagEnd, access, title, instance) {
+	qt.TagButton = function( id, display, tagStart, tagEnd, access, title, ariaLabel, instance ) {
 		var t = this;
-		qt.Button.call(t, id, display, access, title, instance);
+		qt.Button.call( t, id, display, access, title, ariaLabel, instance );
 		t.tagStart = tagStart;
 		t.tagEnd = tagEnd;
 	};
@@ -549,7 +552,7 @@
 
 	// the close tags button
 	qt.CloseButton = function() {
-		qt.Button.call(this, 'close', quicktagsL10n.closeTags, '', quicktagsL10n.closeAllOpenTags);
+		qt.Button.call(this, 'close', quicktagsL10n.closeTags, '', '', quicktagsL10n.closeAllOpenTags);
 	};
 
 	qt.CloseButton.prototype = new qt.Button();
@@ -580,7 +583,7 @@
 
 	// the link button
 	qt.LinkButton = function() {
-		qt.TagButton.call(this, 'link', 'link', '', '</a>');
+		qt.TagButton.call(this, 'link', 'link', '', '</a>', '', '', quicktagsL10n.link);
 	};
 	qt.LinkButton.prototype = new qt.TagButton();
 	qt.LinkButton.prototype.callback = function(e, c, ed, defaultValue) {
@@ -608,7 +611,7 @@
 
 	// the img button
 	qt.ImgButton = function() {
-		qt.TagButton.call(this, 'img', 'img', '', '');
+		qt.TagButton.call(this, 'img', 'img', '', '', '', '', quicktagsL10n.image);
 	};
 	qt.ImgButton.prototype = new qt.TagButton();
 	qt.ImgButton.prototype.callback = function(e, c, ed, defaultValue) {
@@ -666,18 +669,18 @@
 	};
 
 	// ensure backward compatibility
-	edButtons[10] = new qt.TagButton('strong','b','<strong>','</strong>');
-	edButtons[20] = new qt.TagButton('em','i','<em>','</em>'),
+	edButtons[10] = new qt.TagButton('strong','b','<strong>','</strong>','','',quicktagsL10n.strong);
+	edButtons[20] = new qt.TagButton('em','i','<em>','</em>','','',quicktagsL10n.emphasized),
 	edButtons[30] = new qt.LinkButton(), // special case
-	edButtons[40] = new qt.TagButton('block','b-quote','\n\n<blockquote>','</blockquote>\n\n'),
-	edButtons[50] = new qt.TagButton('del','del','<del datetime="' + _datetime + '">','</del>'),
-	edButtons[60] = new qt.TagButton('ins','ins','<ins datetime="' + _datetime + '">','</ins>'),
+	edButtons[40] = new qt.TagButton('block','b-quote','\n\n<blockquote>','</blockquote>\n\n','','',quicktagsL10n.blockquote),
+	edButtons[50] = new qt.TagButton('del','del','<del datetime="' + _datetime + '">','</del>','','',quicktagsL10n.deletion),
+	edButtons[60] = new qt.TagButton('ins','ins','<ins datetime="' + _datetime + '">','</ins>','','',quicktagsL10n.insertion),
 	edButtons[70] = new qt.ImgButton(), // special case
-	edButtons[80] = new qt.TagButton('ul','ul','<ul>\n','</ul>\n\n'),
-	edButtons[90] = new qt.TagButton('ol','ol','<ol>\n','</ol>\n\n'),
-	edButtons[100] = new qt.TagButton('li','li','\t<li>','</li>\n'),
-	edButtons[110] = new qt.TagButton('code','code','<code>','</code>'),
-	edButtons[120] = new qt.TagButton('more','more','<!--more-->\n\n',''),
+	edButtons[80] = new qt.TagButton('ul','ul','<ul>\n','</ul>\n\n','','',quicktagsL10n.bulllist),
+	edButtons[90] = new qt.TagButton('ol','ol','<ol>\n','</ol>\n\n','','',quicktagsL10n.numlist),
+	edButtons[100] = new qt.TagButton('li','li','\t<li>','</li>\n','','',quicktagsL10n.listitem),
+	edButtons[110] = new qt.TagButton('code','code','<code>','</code>','','',quicktagsL10n.code),
+	edButtons[120] = new qt.TagButton('more','more','<!--more-->\n\n','','','',quicktagsL10n.more),
 	edButtons[140] = new qt.CloseButton();
 
 })();
Index: src/wp-includes/script-loader.php
===================================================================
--- src/wp-includes/script-loader.php	(revision 31608)
+++ src/wp-includes/script-loader.php	(working copy)
@@ -97,7 +97,19 @@
 		'toggleFullscreen'      => esc_attr__( 'Toggle fullscreen mode' ),
 		'textdirection'         => esc_attr__( 'text direction' ),
 		'toggleTextdirection'   => esc_attr__( 'Toggle Editor Text Direction' ),
-		'dfw'                   => esc_attr__( 'Distraction-free writing mode' )
+		'dfw'                   => esc_attr__( 'Distraction-free writing mode' ),
+		'strong'                => esc_attr__( 'Bold' ),
+		'emphasized'            => esc_attr__( 'Italic' ),
+		'link'                  => esc_attr__( 'Insert/edit link' ),
+		'blockquote'            => esc_attr__( 'Blockquote' ),
+		'deletion'              => esc_attr__( 'Deleted text (strikethrough)' ),
+		'insertion'             => esc_attr__( 'Added text' ),
+		'image'                 => esc_attr__( 'Image' ),
+		'bulllist'              => esc_attr__( 'Bulleted list' ),
+		'numlist'               => esc_attr__( 'Numbered list' ),
+		'listitem'              => esc_attr__( 'List item' ),
+		'code'                  => esc_attr__( 'Code' ),
+		'more'                  => esc_attr__( 'Insert Read More tag' ),
 	) );
 
 	$scripts->add( 'colorpicker', "/wp-includes/js/colorpicker$suffix.js", array('prototype'), '3517m' );