Alerts sent via defined actions are a bit short on information by default. There are a number of additional macros you can specify (as of September 2008 - Zabbix 1.6):
{DATE}
{ESC.HISTORY}
{EVENT.AGE}
{EVENT.DATE}
{EVENT.ID}
{EVENT.TIME}
{HOSTNAME}
{IPADDRESS}
{ITEM.LASTVALUE}
{ITEM.NAME}
{PROFILE.CONTACT}
{PROFILE.DEVICETYPE}
{PROFILE.HARDWARE}
{PROFILE.LOCATION}
{PROFILE.MACADDRESS}
{PROFILE.NAME}
{PROFILE.NOTES}
-
{PROFILE.SERIALNO}
{PROFILE.SOFTWARE}
{PROFILE.TAG}
{STATUS}
{TIME}
{TRIGGER.COMMENT}
{TRIGGER.ID}
{TRIGGER.KEY}
{TRIGGER.NAME}
{TRIGGER.SEVERITY}
{TRIGGER.STATUS}
-
{TRIGGER.VALUE}
In order to translate these values to your own language, edit que source code of src/libs/zbxserver/expression.c and recompile it.