[Koha] Language chooser doesn't work

[Sander898]

Hi everyone, 
I have installed Koha 3.8.1 on Centos 6 (i386). 

Everything is ok, but I have this problem:

when I'm cataloging i cannot choose any language from the tag 101$a; I mean:
if I try to open the sub menu for this tag nothing appear (the same
situation for the tag 102$a):

http://koha.1045719.n5.nabble.com/file/n5719749/Immagine_1.png 

Any idea to solve this problem?

Thanks and kind regards
Sander

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