I'm already downloaded the .quest file, but the game was writen in english. How can i translate the whole game into another language? or how can i run it on my broswer so i can use the translater?

Translating games is usually pretty difficult unless they were designed for it, because the strings within the game might not be in complete sentences. If you're running the game in a web browser (playing online), some browser extensions may be able to translate it; but some might not work so well with JS-heavy pages.

The last time I tried to play a Quest game in another language, I used the Google Translate app on my phone. Its camera mode will let you point the camera at your computer screen and show a live translation of whatever words are there, and running it on a separate device means there can't be any compatibility issues between the game and the translator.
(this also works for online fiction sites like Wattpad, whose copy-protection occasionally causes problems for Google Translate. Pointing my phone's translator at the screen works fine)