Only copy text to aria_label if there was no aria_label attribute originally.

Author: sspickle

lib/glow/primitives.js

@@ -3241,7 +3241,10 @@
 	        get text() {return attrs.text},
 	        set text(value) {
 	        	attrs.text = value
-	            $(attrs.jbutton).html(attrs.text).attr('aria-label', value)
+				$(attrs.jbutton).html(attrs.text)
+				if (!attrs.aria_label) {
+					$(attrs.jbutton).attr('aria-label', value)
+				}	            
 	        },
 	        get textcolor() {return attrs.color}, // legacy name; no apparent reason why it was "textcolor" instead of "color"
 	        set textcolor(value) {