If you comment your source code in another language than english, you probably want to have the rest of your document in your selected language, too. First of all, the attribute xml:lang of the root tag, e.g. book, must be set. But there are also several text parts which are generated by dbdoclet itself. To specify the language and the country define the properties locale.language and locale.country.

To select the proper encoding of your files use the options -docnecoding and -encoding.