object grid: select field, show label text instead of value

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@4121 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
build auto version (3029) ...

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@4122 1f8fe7d8-47f0-464c-8d0a-336f4953ab05