Added an english translation of the website. * website/about.htm4, website/buildhtml.mk, website/contact-de.htm4, website/contact.htm4, website/development-de.htm4, website/development.htm4, website/donate-de.htm4, website/donate.htm4, website/download.htm4, website/img/funktionsweise-MXD2map-de.png, website/index.htm4, website/license-de.htm4, website/license.htm4, website/template_header.m4, website/img/funktionsweise-MXD2map.png, website/img/funktionsweise-MXD2map_small.png, doku/funktionsweise/funktionsweise-MXD-konverter.svg, website/img/funktionsweise-MXD-konverter.png, website/img/funktionsweise-MXD-konverter_small.png: English translation of the website. Added a new Makefile-Target 'images' to get the dokumentation-images into the site.

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