added a couple more aliases for ids mapping to same image

etemplate/js/et2_widget_button.js

@@ -79,11 +79,11 @@ var et2_button = et2_baseWidget.extend([et2_IInput, et2_IDetachedDOM],
 		cancel: /cancel(&|\[|$)/,
 		delete: /delete(&|\[|$)/,
 		edit: /edit(&|\[|$)/,
-		next: /next(&|\[|$)/,
-		finish: /cancel(&|\[|$)/,
-		previous: /delete(&|\[|$)/,
+		next: /(next|continue)(&|\[|$)/,
+		finish: /finish(&|\[|$)/,
+		back: /(back|previous)(&|\[|$)/,
 		copy: /copy(&|\[|$)/,
-		more: /cancel(&|\[|$)/,
+		more: /more(&|\[|$)/,
 		check: /check(&|\[|$)/,
 		ok: /ok(&|\[|$)/,
 		close: /close(&|\[|$)/,