Hello,
That very much depends on "which quotes?". I've seen mentions of quotes
inciting hatred against certain groups and quotes from a certain
historical period that you are not allowed to repeat in Germany without
extensive discussion of historical context. I cannot see anybody
reviewing every language to make sure those quotes are reliably removed.
There are no quotes inciting hatred and violence (or, I haven't seen
any), they are very old jokes that were deemed funny 25-30 years ago
when they were written. I assure you that old books with jokes don't
become illegal after a certain number of years, even if some of the
jokes themselves might no longer be considered funny or civilised.
It would probably be very helpful if you actually did go and read the
things you are talking about, before talking about them.