No valid and trusted encryption key was found for "%1". Select the key(s) which should be used for this recipient. If there is no suitable key in the list you can also search for external keys.
Nenia valida kaj fifata ŝlosilo estas trovita por "% 1". Elektu la ŝlosilo( j) n, kiu( j) n vi volas uzi por tiun adresaton. if in your language something like 'key( s)' isn' t possible please use the plural in the translation