This Create you own list radio question - manual.limesurvey.org/Question_type_-_List_%28Radio%29 maybe works too,
but I found new easier solution to this. In this new version 2.50+.160426 you can choose that List(radio) type and close&save. Then click this link Warning: You need to add answer options to this question. You can now press Quick add... and type all choices then you can "Save as a label set" and use it all buttons you need