[XeTeX] changing \chaptername in polyglossia

[Pablo Rodríguez]

Hi there,

from section 6 from the polyglossia documentation, I guess that I can 
replace the Spanish chapter name with Tema writing:

    \gappto\spanishcaptions{\renewcommand{\chaptername}{Tema}}

But the following code has the standard name “Capítulo” as chapter name:

    \documentclass[10pt]{book}
    \usepackage{polyglossia}
    \setdefaultlanguage{spanish}
    \gappto\spanishcaptions{\renewcommand{\chaptername}{Tema}}
    \begin{document}
    \chapter{Hola}
    Este es un documento de prueba.
    \end{document}

Could anyone tell me what I am doing wrong here?

Thanks for your help,


Pablo


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