How to remove "Please fill out this field" Firefox message

[lanoiabcn]

Hello, I would like to know how can I remove the "Please fill out this field." message, that shows automatically in a newsletter form in my website:
- as a help tip popup (yellow box)
- when I click subscribe and the field is not filled

I'm using a wordpress. It's in two languages, and the "Please fill out.." message, it's shown always in the FF installed language.
It doesn't work with the translation plugin I'm using, so I need to disable the pop up from the web. Is it possible?? It only happens with Firefox. Other browsers don't have this message.

Thank you very much in advance

[therube]

URL?

[lanoiabcn]

http://bcncisneros.es/showroom/newsletter/

[Daifne]

moved to Web Development

[trolly]

I'm not entirely sure but I think you can only disable it through removing the required attribute and implementing a client side verification.

[AlfonsoML]

Other browsers don't have this message

Are you sure?
Which browsers have you tested?

I've checked and both Chrome and IE show the same warning

[lanoiabcn]

Safari doesn't show it

[trolly]

Safari ignores the required attribute.
http://www.w3schools.com/tags/att_input_required.asp

[jscher2000]

To use your own tooltip on the field, try adding this to your input:

title="Dirección de correo electrónico"

(in the relevant language, of course)

But I don't know whether you can control the language of the pop-up that appears when clicking Subscribe with the field blank.