Adds missing translated messages for PT-BR

Partially fix #spring-projectsgh-9315

Adds Brazilian Portuguese translation missing for following messages in messages_pt_BR.properties;
- ExceptionTranslationFilter.insufficientAuthentication 
- LdapAuthenticationProvider.badLdapConnection
- PersistentTokenBasedRememberMeServices.cookieStolen

core/src/main/resources/org/springframework/security/messages_pt_BR.properties

@@ -31,11 +31,11 @@ DigestAuthenticationFilter.nonceExpired=Nonce expirou/tempo esgotado
 DigestAuthenticationFilter.nonceNotNumeric=Nonce token deveria ter um primero token num\u00E9rico, mas tem {0}
 DigestAuthenticationFilter.nonceNotTwoTokens=Nonce token deveria ter dois tokens mas tem {0}
 DigestAuthenticationFilter.usernameNotFound=Usu\u00E1rio {0} n\u00E3o encontrado
-#ExceptionTranslationFilter.insufficientAuthentication=Full authentication is required to access this resource
+ExceptionTranslationFilter.insufficientAuthentication=Autentica\u00e7\u00e3o completa \u00e9 necess\u00e1ria para acessar este recurso
 JdbcDaoImpl.noAuthority=Usu\u00E1rio {0} n\u00E3o tem permiss\u00E3o
 JdbcDaoImpl.notFound=Usu\u00E1rio {0} n\u00E3o encontrado
 LdapAuthenticationProvider.badCredentials=Usu\u00E1rio inexistente ou senha inv\u00E1lida
-#LdapAuthenticationProvider.badLdapConnection=Connection to LDAP server failed
+LdapAuthenticationProvider.badLdapConnection=Conex\u00E3o com servidor LDAP falhou
 LdapAuthenticationProvider.credentialsExpired=Credenciais expiradas
 LdapAuthenticationProvider.disabled=Usu\u00E1rio desabilitado
 LdapAuthenticationProvider.expired=Conta expirada
@@ -43,7 +43,7 @@ LdapAuthenticationProvider.locked=Conta bloqueada
 LdapAuthenticationProvider.emptyUsername=Nome vazio n\u00E3o permitido
 LdapAuthenticationProvider.onlySupports=Somente UsernamePasswordAuthenticationToken \u00E9 suportado
 PasswordComparisonAuthenticator.badCredentials=Usu\u00E1rio inexistente ou senha inv\u00E1lida
-#PersistentTokenBasedRememberMeServices.cookieStolen=Invalid remember-me token (Series/token) mismatch. Implies previous cookie theft attack.
+PersistentTokenBasedRememberMeServices.cookieStolen=Diverg\u00eancia inv\u00e1lida em remember-me token (Series/token). Implica um ataque pr\u00e9vio de roubo de cookies.
 ProviderManager.providerNotFound=Nenhum AuthenticationProvider encontrado para {0}
 RememberMeAuthenticationProvider.incorrectKey=O RememberMeAuthenticationToken apresentado n\u00E3o cont\u00E9m a chave esperada
 RunAsImplAuthenticationProvider.incorrectKey=O RunAsUserToken apresentado n\u00E3o cont\u00E9m a chave esperada