[Koha] Can't Switch Language- help

[Jonson philip]

Hi
i'm trying  koha V. 3.4.1 i can,t switch between language in opac or staff ,
i founded a patch No.
3858<http://bugs.koha-community.org/bugzilla3/attachment.cgi?id=3858&action=diff>but
no changing . any
help
 thank's
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