Hi,
I installed Formit and I install MODx in french.
Everythings seems to be infrench.
When I send my formular, there is french message for the empty field, but I aslo have that message:
A form validation error occurred. Please check the values you have entered.
I am a bit surpise to have it in english.
Then I went to Setting ->Lexique and filter all entries by ‘formit’. Additional, I can filter by english or french
When I filter by french, as show above, I can see that some has not been translate, but it does matter. My problem, I can not find the text
A form validation error occurred. Please check the values you have entered
then I can not translate it. Then, where is it? 
Cheers
Use the property &validationErrorMessage
to define the error message.
It’s here in the code. But don’t change it in the file. Use the corresponding property.