Spanish apt-mark translation fix

Spanish apt-mark translation fix

"%s can not be marked as it is not installed." was incorrectly
translated as "%s no se puede marcar como no instalado.\n",
which means "%s can not be marked as not installed."

Thanks to Marcos Del Sol Vives for reporting & to the spanish
translation team – and in particular Camaleón and Venturi –
for review and correction of this issue!

[commit message by commiter]

Closes: 817999