In addition to parameters, the stylesheets come with translations for strings that are generated. For example, one of the parameters lets you control how titles are formatted:

   <l:context name="title-numbered">
      <l:template name="appendix" text="Appendix %n. %t"/>
      <l:template name="article/appendix" text="%n. %t"/>
      <l:template name="chapter" text="Chapter %n. %t"/>
      <l:template name="section" text="%n. %t"/>
   </l:context>