Make sure you copied the content elements required by aiContactSafe in Joom!Fish. Pressing "Activate Joom!Fish" in the control panel of aiContactSafe will do this automatically.
Then access the administrator page, top menu, "Components", "Joom!Fish", "Translations", select the language you want to translate the text into and the content element related to aiContactSafe. I suggest trying all 3 of them since you will find different texts in different content elements.