new phrases to be translated

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/expm@82 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
messages better translatable; translation update

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/expm@83 edb9625f-4e0d-4859-8d74-9fd3b1da38cb