Can not change language

I can not change language of UE 4.6.1 and 4.5.1.
Opening the preference page or selecting the language freezes UE.

I am using MacOSX 10.10.2, and I could change language in UE 4.7.4.

[screen movie][1]

http://www.11moon.com/UE4/bugs/change_language_bug.mp4

Hey Tofuji,

Thank you very much for your report today regarding the language preferences in UE 4.6.1 and 4.5.1 not being able to be changed. This issue has since been resolved and is available for use in UE 4.7.4. With each update we have on the engine, new features are added and bug fixes are being implemented in as well.

Cheers!