No, there is only support for replacing opening and closing quotation marks. Raplacement of umlauts is not required, because you can use them directly in your document, if you insert the following lines into your document's preamble (before the <code>\begin{document}</code>):

\usepackage[ngerman]{babel}
\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}

You have to replace the optional parameter of the <var>'babel'</var> package with your language's name.