OK,

You need to mod the D for the alert (use navspeak).

so:

D = alert (modded)
E = rename an unmodded copy of D to E.
Fre = leave alone.

Mod the text to have

Alert on/off

D = on
E (now copied/unmodded D) = off
Fre = blank (no text).

Ah ok check.
So I have now:

D= alert (modded)
E = renamed gb
Fre = nothing done

In navboot change
in german Language change Menupoints
1/347 Poi alert
1/348 on
1/349 off
1/350 blank

now do i have to copy all textes from
Lng_Deutsch to Lng_English
and
Lng_Deutsch to Lng_Francais

so i can change the Menupoints on/off alerts and i always have a "german" voice and text?

??? no, copy the lng_de to lng_esp.

OK, good

OK.
NO, why, you want the language (text and voice) in german right?

So lng_de to lng_esp (text, and voice).

No need FRE is not used.

Yes, but only by the way I've shown.

Note: the langauge swap only works for then Nav system, if you have the OEM phone, TV and TMC then they retain ther selected laguange (as they have there own langauge files)

done ty.
burn and test if i dont forget anything else

Cool :)

So after burning it... It dont work as i supposed...
Nightview is wrong... Must look again what i done wrong... The themes hasnt the right color....
And replacing the language files also dint work. When i want to change allert off it change the menu language to the default...
Also it dont beep when i come near to a speed cam...

Are there any additional modifications required for 2012 HIGH as it was the case with 2011 HIGH?

Yes, if you want to use a SL disc instead of a DL, I've not got one available, but you should be able to use the 2011 disc as a template.

I removed the voice alert after using it for a long time. Now the radio still lowers the volume when approaching a traffic cam, like when the alert was still there, but the voice phrase itself is missing (of course, I'm using the stock voices again now). Is this normal? I can't tell, because I only used the poison mod with alerts until now. Is patch.exe needed even if I don't want the voice alert?

No, but you will need to use an unmodded version of the navboot file and an unmodded version of the voice file, and then make a different version number (for both OS and voice), so that it reloads the new language files.