Removed blank lines from xmlsitemap_url().

_xmlsitemap_calc_priority() is now xmlsitemap_node_priority().

1. fixed many common speech strings
2. new translation was created with the German translation rules in mind (for e.g do not translate "node" to "Knoten")
3. old file was ISO-8859-1 and not UTF-8 - now it is encoded with UTF-8 (and ist MUST be UTF-8!)
4. fixed many destroyed chars caused by ISO encoding
5. added new and missing strings