This will fail the i18n lint checking as there are multiple unnamed placeholders in the same string.  Instead do (untested):

     <%= (_("Version %{version} © 2009-%{year} Paul Kelly and %{author}") % { :version => [SETTINGS[:version], :year => DateTime.now.year, :author => link_to("Ohad Levy", "mailto:ohadlevy@gmail.com") }).html_safe %>