If you modify original alarm message in probe side, UMP do not know the change. To prevent inconsistency from happening, probe will remove "i18n_token" for alarm message that have been modified.
No resolution for this behavior.
Not all monitoring probes have "i18n_token" for alarm message. (for example, logmon alarm does not have "i18n_token") For alarm message which does not have "i18n_token", UMP uses original alarm message for display.