Hi Diego,
Can you try editing the script, change this:
ALTER TABLE [dbo].[sts_WebFormQuestion]
ALTER COLUMN [CssClass] [nvarchar](100) NOT NULL
GO
to this:
ALTER TABLE [dbo].[sts_WebFormQuestion]
ALTER COLUMN [CssClass] [nvarchar](100) NULL
GO
I think it was a mistake that column should allow null.
I'm not sure what you mean about the missing resource key "ShowPageRightContent", there is not setting with that name in Form Wizard as far as I know.
Thanks,
Joe