In the current spring-boot / thymeleaf, some of the html views have a form where a field with like this is present:
The issue is Spring Message treat Ú as seperate & U a c u t e letters and not as Ú.
Ú
&
U
a
c
u
t
e
Ú
Change the message to unicode as below
account.sobrenome=\u00daltimo nome
and use
th:placeholder="#{account.sobrenome}"