How To set default htmleditor align from "justifyleft" to "justifyright"

[gnostic]

I take a lot of time for change defalut align toggle of htmleditor from "justifyleft" to "justifyright", and could not success.
I set "RTL = true;" for editor, and i expect that "justifyleft" automatically change to "justifyright", but did not change.

I also test this way, but this code mixed justify buttons operation and not working.

 if (me.enableAlignments) {
            items.push(
                '-',    
                btn('justifyfull',false), 
                btn('justifyright',true), 
                btn('justifycenter'false),
                btn('justifyleft',false)
            );
        }