I changed the language of my DS to play Days in English, because the German translation was so bad it almost made me cry. It was an offense to both German language and Kingdom Hearts.
Funny you mention Days just now as I finally started to play that entry for the first time (taking a break from Kid Icarus: Uprising for a while) this week. I'm just up to Day 118 (119?) where they get vacation and I didn't yet find much to complain about the German dialogue.
This sounds harsh, but they probably think that the people that shy away from buying the game because of no Italian/Spanish subs are not worth the afford of translating the game for them. It's sad, but that's what a lot of publishers seem to think.
And I doubt that a lot of people who want the game that much that they would even buy a new handheld for it would refrain from doing so just because the game has English subs only. Some will of course, but most fans will probably buy it regardless.
That's also a possibility, although I still make an destinction between subtitles and the actual voice acting. When looking in German KH forums (which I normally tend to avoid) I see there quite a bunch of people complaining about not getting German
voices. That is uneccessary whining in my book when you still have the subtitles in your own language.
But scratching the subtitles too...I think German and French fans would be quite pissed as well if they would do that here.
That really depends on the individual I would think, last time I checked the petition there were already over 2.300 sign ups in two Days, so it does seem to be a severe issue.
Add on top of this that many European fans in general might already be somewhat "on the fence" because Square often neglects Europe when it comes to KH (like now again concerning the 10th Anniversary, there is
nothing announced for Europe yet except the standard version of DDD), and such bursts of rage might be more understandable.
EDIT:
I do agree with what others said here however that now "boycotting" the game won't help issues at all.
If the worst case happens, Square might even decide to stop releasing KH games in Spain and Italy completely.