How can I edit a language translation?

We are using persian discourse too.
custimizing text in admin panel can do something for you but changing some text in string can destroy your site.look here. It happens to us last week and it doesn’t fix until we change the website language throw database to english. this is discourse’s problem for farsi and I’m waiting for it’s sovation.
don’t scare of changing some translation.If it brokes you can delete your translation from database.