This Italian song, sang by ,amongst others Amalia Rodriguez, who actually was Portuguese herself,
was composed by R Fratello.
Can anyone help me with a translation in english, please?

This should be R. Fratello's lyrics, there's another version much longer. According to the italian translation, here's the english one:

Lu sabatu si sapi è allegra cori/ saturday as we know, gladdens the heart
biatu cu àvi bedda la muggheri./ lucky who has a lovely wife
Cu l'àvi bedda ci porta li dinari/ who has a beautiful life brings her money
cu l'àvi brutta ci mori lu cori./ who has an ugly wife feels his heart dying
Ciuri, ciuri/ flower flowers
ciuri di tuttu l'annu/ flowers all the year
l'amuri ca mi dasti ti lu tornu.../ the love you gave me I give you back
Ciuri, ciuri/ flower flowers
ciuri di tuttu l'annu/ flowers all the year
l'amuri ca mi dasti ti lu tornu.../ the love you gave me I give you back

Si troppu dispittusu tu ccu mia/ you're too vexatious with me
cascu du lettu su mi 'nsonnu a tia,/ i fall from bed if i dream of you
si bruttu 'nta la facci e 'nta lu cori/ your face and heart are ugly
cu tia ju' non mi vogghiu maritari./ i don't want you to be my wife
Ciuri, ciuri/ flower flowers
ciuri di tuttu l'annu/ flowers all the year
l'amuri ca mi dasti ti lu tornu.../ the love you gave me I give you back
Ciuri, ciuri/ flower flowers
ciuri di tuttu l'annu/ flowers all the year
l'amuri ca mi dasti ti lu tornu.../ the love you gave me I give you back
.
Ciuri di rosi russi a lu sbucciari/ red roses in blossom
amara a cui li tò paroli criri./ poor who believed in you
L'omini siti tutti munsignari/ ye men are all liars
jù non ti vogghiu no! Ti nni pò iri. / I don't want you anymore, you can leave

As the thank you doesnot show again I send it this way to you.
Thanks that is, for all of the latest translations together/insieme!
It really helps me a lot. mai troppo