Correct, the new language file must be uploaded and this does not happen if you dont have a different load point for the voice files, you must force a reload of these files or the nav computer will use the ones stored in it's memory (unmodded).

You must edit the lng_rel.tbl file for the new dir to be "seen" by the nav computer when loading the new voice files.

For the POI alert on/off, you need to do some conversion of languages, here in the UK the default languages are;

1= GB(F)
2= FRE(F)
3= GER(F).

1 and 2 need to be changed for the on / off to work, so,

1= GB(F), modded with alert and text from GB to "on".
2= GB(F), unmodded, with no alert, and text from F to "off".
2= GER(G), OEM, text from D to "".

Correct its a renamed GB(F) voice file.

I don't know, I've never seen an OEM German setup, but

1= Ger(F),
2= ???,
3= ???

would need to be

1= Ger(F), with alert and text from G to "on".
2= Ger(F) OEM, (no alert) and text from ?? to "on".
3= ??? and text from ?? to "".

Each country will have to modify there own set of 3 languages for this mod to work, that why I only did the one for the UK as I knew what was need for the UK, my modded file will only work correctly in the UK, you must modify the 3 languages for yours.

The link above is for the USA, so the principle is the same but the languages different.

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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.