There is a problem with the encryption key(s) for "%1". Please re-select the key(s) which should be used for this recipient.
Mae problem efo' r allwedd( au) cêl- ysgrifo ar gyfer "% 1". Ail- ddewiswch yr allwedd( au) a ddylir eu defnyddio ar gyfer y derbyniwr yma. if in your language something like 'key( s)' isn' t possible please use the plural in the translation