Hi!, I'm a member of the Spanish translation team. The given diff cannot be applied "as is" without previous review by our team and also the translator of that file (CC'ing him now).
A more appropriate translation would be: #: cmdline/apt-mark.cc #, c-format msgid "%s can not be marked as it is not installed.\n" msgstr "%s no se puede marcar porque no está instalado.\n" But the final decision is on the owner the file. Thanks. -- Camaleón
