The translation provided J.W. Laidlay, according to Jacq-Hergoualc'h is given below:
a. I acknowledge the enemies of the contented king Ramaunibha and the wicked are ever afflicted.
b. This is said by Manikatha, the protector of all great Buddhas.
c. In every form of life, knowledge becomes manifest everywhere and in every way.
d. Karma, which sports with passion, is the cause of transmigration.
The Malay Peninsula: Crossroads of the Maritime Silk Road (2001) by Michel Jacq-Hergoualc’h, Translated by Victoria Hobson; Brill Academic Publishers, p.214]
The attached file is taken from here:
Laidlay JW (1848)
Note on the Inscriptions from Singapur and Province Wellesley forwarded by Hon. Col. Butterworth, CB and Col J. Low, JASB, XVII, 2:66-72
According to Laidlay, the translation was done by Babu Rajendra Lal Mittra.
I am still not sure if the language is Pali or Sanskrit.