Employment Based Greencard

Friends,
My interview has been schedule and I'm preparing for it now. I have a question about certified translations:

I have already submitted certified translations of birth and marriage certifications.
My translations do not include have the translator's statement "I swear under penalty of perjury that I am competent to translate from ______ to English,"
Instead, it reads " I, name of translator, certify that this translation is a true and correct translation of the original document that was presented to me."

This is a trivial issue, but you can't be too careful. Do I need another translation or these variations in translator statements are fine?

I came across this advice on a legal website, and it got me thinking about my translations:
"Any foreign language documents that you bring, such as birth certificates from other countries, must not only be fully translated into English, but be accompanied by a statement from the interpreter that says something like, “I swear under penalty of perjury that I am competent to translate from ______ to English, and that this translation is a true and complete translation of the attached document.” The name of the translator and the date and place of translation should also be written into the statement."