fix: localize validation and api messages

server/src/app.ts

@@ -43,11 +43,11 @@ export function buildApp() {
 
   app.setErrorHandler((error, _request, reply) => {
     if (error instanceof ZodError) {
-      return reply.code(400).send({ error: 'Invalid request', details: error.flatten() });
+      return reply.code(400).send({ error: 'Dados inválidos.', details: error.flatten() });
     }
 
     app.log.error(error);
-    return reply.code(500).send({ error: 'Internal server error' });
+    return reply.code(500).send({ error: 'Erro interno no servidor.' });
   });
 
   const checkDatabase = async (_request: unknown, reply: { code: (statusCode: number) => { send: (payload: object) => unknown } }) => {