dokuwiki commit c33b315b on 2013-02-17 removed deprecated functions. Among others the function plugin_locale_xhtml() and plugin_render() which was used by the backup plugin.
This patch replaces those functions by locale_xhtml() and render(), which are the replacement.

see https://github.com/splitbrain/dokuwiki/commit/c33b315b
Fixed donation link

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German language files added
Merge pull request #3 from dsp77/master

Fix for new Weatherwax changes