What prayer do you say when light a menorah on sabbath?

The traditional prayer recited when lighting the menorah on Sabbath is called the "Maariv Anachnu" prayer. Here is the transliteration and translation of the prayer:

Transliteration:

Maariv anachnu, v'shamor b'tzivkha, lak'desh shamcha ba'olam, bamitzvat hadlakat ner shel Shabbat.

Barukh atah Adonai, Eloheinu Melekh ha'olam, asher kidshanu b'mitzvotav, v'tzivanu l'hadlik ner shel Shabbat.

Translation:

We kindle these lights in fulfillment of the commandment to kindle the Sabbath light.

Blessed are You, Adonai our G-d, King of the universe, Who has sanctified us with His commandments, and commanded us to light the Sabbath lights.

It's important to note that there might be slight variations in the prayer depending on the specific tradition or prayer book being used.