the locale has
mon "<U004A><U0061><U006E><U0065><U0069><U0072><U006F>";/ "<U0046><U0065><U0076><U0065><U0072><U0065><U0069><U0072><U006F>";/ "<U004D><U0061><U0072><U00E7><U006F>";/ ...
those describe the letters for the months and are capital letters
the locale has
mon "<U004A> <U0061> <U006E> <U0065> <U0069> <U0072> <U006F> ";/
"<U0046> <U0065> <U0076> <U0065> <U0072> <U0065> <U0069> <U0072> <U006F> ";/
"<U004D> <U0061> <U0072> <U00E7> <U006F> ";/
...
those describe the letters for the months and are capital letters