Contact Form 7 some strings untraslated

Hello everybody,

I have written directly to the plugin support, but I thought is also better if I put the question here, if somebody has also the same problem and has a tip.
The question is:

In Contact Form 7, some strings are not showed in the translation edit page for translating. I mean, for example, the string “your message was sent succesfully” or “please, check all the blanks”. They are not shown to translate.

On the other hand, strings that are shown to translate in the translation edition page and translated succesfully, when is time to work, they don’t. I mean that for example “Please, enter a right e-mail value” or “please, write a telefon number with at least 9 numbers”. They appear for translating but in fact, they aren’t.

Someone with the same trouble? Any Idea?

Thank you for your time.

The page I need help with: [log in to see the link]