Has one noted variations in prayer?
This has bothered me too, so I just say what is also said as often,
“He descended to the **dead.” **and I admit I had not investigated this fully.
Yet, I have from the “Divine Mercy Message and Devotion” pamphlet (page 34)(published by the Association of Marian Helpers) that this statement is in fact, “text from official approved translation. See Holy Saturday Liturgy in the Roman Missal”
Now, there is another common variant in this prayer. Do not people sometimes say “He was conceived by the Holy Spirit” whereas again, this book reads “He was conceived by
the power of the Holy Spirit.” It throws me off pace in the Rosaries at the Church every time too!

but it seems proper.
I will thus give the full version from the Holy Saturday Liturgy in the Roman Missal and I type it as given, per all capital letters, etc.
"I believe in God, the Father almighty, creator of Heaven and earth.
I believe in Jesus Christ, His only Son, our Lord. He was
conceived by the power of the Holy Spirit, and born of the Virgin Mary. he suffered under Pontius Pilate, was crucified, died, and was buried.
He descended to the dead. On the third day He rose again. He ascended into heaven, and is seated at the right hand of the Father. He will come again to judge the living and the dead.
I believe in the Holy Spirit, the holy catholic Church, the communion of saints, the forgiveness of sins, the resurrection of the body, and the life everlasting. Amen."
Just avoid the confusing parts!