fixed set if get is get@{} without -> set


git-svn-id: svn://svn.code.sf.net/p/fhem/code@4580 2b470e98-0d58-463d-a4d8-8e2adae1ed80
correction for attr poll_interval and german documentation

git-svn-id: svn://svn.code.sf.net/p/fhem/code@4581 2b470e98-0d58-463d-a4d8-8e2adae1ed80