Sorry, my german is not very good.
your hostprovider does not allow execution of PHP-script that are writtable by anyone ==> ERR_WRITABLE_SCRIPT (30)
this is because someone could modify that file and execute it on the server.
you have installed / uploaded / unzipped some php files that have chmod 666 , you should change that in 644
in a unix console: chmod 644 filename
or go in Filezilla : look at the "Permissions" of each file it will say something like "-rw-rw-rw"
change that in "-rw-r--r--" by rightclicking the file, choose "File attributes" and
deselect "group permission write" and "public permission write" or type 644 in the numeric value, click OK and...
That should solve it.