Edit have found it:

Quote:
Warning: Don't use quotation characters (") in the Text Message field (not even \" characters). It will cause fatal errors with opening and/or compiling your map and may need to be fixed by manually editing the VMF in a text editor. Instead, use use detailed quotes (i.e. " and ").

http://developer.valvesoftware.com/wiki/Game_text

iWork925 wrote:
&crlf;

What?

neco wrote:
I never used it but as far as I remember you have to edit the .vmf file manually with an external text editor, since hammer sc***s it up.

Edit have found it:

Quote:

Warning: Don't use quotation characters (") in the Text Message field (not even \" characters). It will cause fatal errors with opening and/or compiling your map and may need to be fixed by manually editing the VMF in a text editor. Instead, use use detailed quotes (i.e. " and ").

http://developer.valvesoftware.com/wiki/Game_text

I'll see what this is.

Edit: Ok, that site didn't help.