[Patch] Add Content-Type headers to html pages

We have utf-8 umlauts in the titles of subpages. Some webbrowsers
assume the page is in iso-8859-1 and display the umlauts incorrectly.

Adding the charset to the HTMLCONTENTTYPE doesn't help as that is only
used by the CGI scripts, not the statically generated html pages.

Here is a patch that adds proper META headers to all html pages
(static and dynamic). Please consider it for inclusion in SVN.

Christoph
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