Use attributes in format region_from and region_to= to change the languages showing in language switcher. Available regions are: europe_from europe_to
asia_from asia_to
mideast_from mideast_to
america_from america_to
Example:
europe_from=0 europe_to=22 will put all languages (ordered in language switcher settings) from 1 to 21 to Europe region:
asia_from=22 asia_to=25 will put all languages from 23 to 24 (so only 2) into Asia region.