Overwriting intent/widget Buttons

[asm278]

It seems that XLSForms don't yet support overwriting the default value for the noAppErrorString attribute of a widget/intent button. Therefore, all errors are the ODK default.

[eak24]

As @asm278 suggested this morning, let's just add helper text that says "If an error occurs, please download this app" and in Spanish: "Si se produce un error, descargue esta aplicación" where app/aplicación is a clickable link... I think you can do this by writing it as html... I think that the collect code runs the messages through an html preprocessor? If the clickable link is not implementable under normal the collect code, let me know!