Hi Minny! To me, that makes no difference in French.
I don't know about whether it makes any difference in English or not, but I'd say "French proverbs are beautiful" sounds more fluent than "The old French proverbs are beautiful". Or if you use the definite article in English with the plural, it probably means that a certain number of proverbs you may know are beautiful in your opinion. But into French you still can't translate using a demonstrative adjective, eg : "Ces vieux proverbes français sont beaux" without any further context, as a translator reading the text above can't make the difference (because the lack of context) Someone who precisely knows which old French proverbs you're talking about would translate differently, probably using a demonstrative (eg : "Ces vieux proverbes français sont beaux".
Did I answer your question
Hi Francky,
Yes thank you so much.
I think I got it.
My book title can read: Anciens proverbes français
and in the text I can write for instance:...Ces vieux proverbes français son beaux...
Thanks a lot! :-)