You can select the language that a recipient has chosen as her or his preferred display language, and you can select from available parameters for the message subject, header, body parameters, and footer. The default text of the message, and the available parameters from which you can select, depend on which notification type you have selected. The parameters you specify get automatically replaced in the sent message by the data specific to the context of the message. That is, if you specify [issue severity], the message, when sent, will place in this location the actual severity of the issue, for example, High.
You can also simply type in additional or replacement text, and that text will appear in the message.