PIMCORE-2060 - More readable error messages when moving asset fails

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3955 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
updated demo data (typos)

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3956 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
updated demo data (typos)

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3957 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
build auto version (2986) ...

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3958 1f8fe7d8-47f0-464c-8d0a-336f4953ab05