Steve,
Can't help you with an accurate translation - I always use Google Translate, as I am sure you do too. I think there is a Brazil based member on here Brspled (?) who you could contact directly. With regard to the photo, I looked for information about Jim Capaldi and his widow, Aninha Capaldi and have copied a Wikipedia entry here from which you might be able to deduce the date. The taller girl in the photo is Scarlet, so the other girl will be the Capaldis' child. It all depends on how old you think the kid looks - 3 or 4?
"...He married Brazilian-born Aninha in 1975 and in 1976 toured with his band Space Cadets before moving to Brazil in 1977. His daughters Tabitha and Tallulah were born in 1977 and 1979, respectively. The Capaldis lived in the Bahia region of Brazil until the beginning of 1980 and while there he became heavily involved with environmental issues. The track "Favella Music" on his 1981 album Let The Thunder Cry arose from his love of Brazil and he worked with several Brazilian composers." Source: Wikipedia
Aninha Capaldi is on a social website where you could send her a carefully worded message asking if she could clarify details for your Zeppelin collection. Mrs Capaldi seems to still be friendly with Charlotte Martin.
Good luck