style fix in error-pages (de, en) and default-indexes

server/conf/error/de/authorizationRequired.html

server/conf/error/de/fileNotFound.html

server/conf/error/de/forbidden.html

server/conf/error/de/internalServerError.html

server/conf/error/de/invalidSyntax.html

server/conf/error/de/methodNotAllowed.html

server/conf/error/de/overloaded.html

server/conf/error/en/authorizationRequired.html

server/conf/error/en/fileNotFound.html

server/conf/error/en/forbidden.html

server/conf/error/en/internalServerError.html

server/conf/error/en/invalidSyntax.html

server/conf/error/en/methodNotAllowed.html

server/conf/error/en/overloaded.html

server/conf/index/standard_index.html_cz

server/conf/index/standard_index.html_de

server/conf/index/standard_index.html_en

server/conf/index/standard_index.html_es

server/conf/index/standard_index.html_fr

server/conf/index/standard_index.html_gr