You need to do several things to get this to work,

0: make a dir in the voices dir on the OS disc image anad copy all the languages over into it (eg OEm = 0506, make 0507)
1: add the alert to the 1st language (as per poison hack)
2: copy then rename the 1st lang to the 2nd lang file name
3: add the text in the 1st text lang
4: copy the 1st lang text to the 2nd lang text,
5: edit the text for the 1st and 2nd lang for the day/night text
6: force a language update by hex editing the correct files.
7: force an update by changeing the version number.

Job done.

All the info is in the POIson thread.

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.