"At least when it's in French, I won't know what the heck they're saying"

This quote by Frank Robinson suggests that he is not positive in his ability to understand the French language. He is likely feeling overwhelmed by the prospect of needing to interact in a language he is not knowledgeable about. He is trying to make light of the scenario by joking that a minimum of he won't understand what is being said. This quote also implies that he understands the reality that he is not proficient in French and is resigned to the truth that he will not have the ability to comprehend the language. He is likely feeling a bit ashamed and disappointed by his lack of knowledge. This quote is an amusing method of expressing his sensations of insufficiency when it pertains to speaking French.