translate text area field automatically

Hi everyone,
I have a table called jobs and I enabled multilanguage in the Misc tab.
I have text area field in this table called message. what I'm trying to achieve here is when the customer chooses the language on the login page, the message field will be translated automatically to his language ( the one he chooses on the login page). in the view or edit page.

how can I accomplish that?.
thank you.