It happens to me also.
You should make a bug report.
Regards
2013/7/24 Krunoslav Šebetić <kruno0407@gmail.com 
<mailto:kruno0407@gmail.com>>
    Hi,
    Have problem with sending opened file do a master document if
    using croatian UI. If local settings, and UI are set to croatian,
    when using File - Send - To master document (in Croatian menu not
    on English as posted here) error is shown: Master document can
    not be saved (again, in Croatian, not English).
    If I change user interface to English, every thing works fine.
    Can tell what's wrong but thought should post it here so other
    local teams can check it to...
    Kruno
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