This translation is not entirely correct. The lyrics are part of Dies Irae, but are from different parts and the part
"to answer the judgement.
A book will be brought forth,
in which all will be written,
by which the world will be judged."
is not mentioned. According to the translation of text I found, the lyrics mean:
Death and nature will be astounded,
when all creation rises again,
Death and nature will be astounded,
Be merciful to my end.
That day of tears and mourning,
when from the ashes shall arise,
the sinner to be judged,
Spare him by your mercy, Lord.
This translation is not entirely correct. The lyrics are part of Dies Irae, but are from different parts and the part "to answer the judgement. A book will be brought forth, in which all will be written, by which the world will be judged." is not mentioned. According to the translation of text I found, the lyrics mean:
Death and nature will be astounded, when all creation rises again, Death and nature will be astounded, Be merciful to my end.
That day of tears and mourning, when from the ashes shall arise, the sinner to be judged, Spare him by your mercy, Lord.
Death and nature will be astounded.