When selecting more than one languages to be shown for the subtitles it brings the results alphabetically. So for example if you select English and Vietnamese the English subs will always be at the top.
I think an option for selecting also the preferred language order would be really helpful. Because scrolling 40 English subs to get your native language is so 80’s 
Thanks
This is a Kodi request. If you want Kodi devs to see it then you should post to http://forum.kodi.tv. OSMC has no bearing on this.
Thanks, will do