Assalamu alaikum wa rahmatullahi barakatuhu.
If a sajdah ayah is read in English or its translation is read, is it necessary to do sajdah?
بِسْمِ اللهِ الرَّحْمنِ الرَّحِيْم
In the name of Allah, the Most Gracious, the Most Merciful
It is waajib upon both the reader and listener of the ayah of sajdah to make the sajdah of tilaawah. You will be required to perform the sajdah of tilaawah, whether it was read in Arabic or English.
Only Allah knows best
Written by Alimah Nasima Umm Hamza
Checked and approved by Mufti Mohammed Tosir Miah
Darul Ifta Birmingham
 Ibn Abideen, Raddul Muhtaar, Volume 2, Page 105