Localize placeholders in privacy contact form

@pmclanahan as explained in issue #1205, this doesn't seem to work (at least locally on my machine). If you check es-ES has both strings already localized, but they're displayed in English.

I can't verify the other messages because I can't see them (I get a generic error when compiling the form on Safari).

Let me know if you want me to open a new bug on Bugzilla for this too.