Translating or writing custom messages on Respect/Validation - php

Question

I'm using Respect to validate some forms in a project but this project is in Spanish and I don't understand how messages work after spending a long time reading the documentation and even its code.
I'm using Slim and I'm using a NestedValidationException following an example I read on a tutorial on Youtube.
This is the validate method:
public function validate($request, array $rules)
{
foreach ($rules as $field => $rule) {
try {
$rule->setName(ucfirst($field))->assert($request->getParam($field));
} catch (NestedValidationException $e) {
$e->findMessages([
'usernameAvailable' => '{{name}} ya existe en la base de datos',
'emailAvailable' => '{{name}} ya existe en la base de datos',
'notEmpty' => '{{name}} no puede estar vacío',
'noWhitespace' => '{{name}} no puede contener espacios',
'email' => '{{name}} debe contener un e-mail válido'
]);
//In English it's enough with
//$this->errors[$field] = $e->getMessages();
$this->$errors[$field] = $e->getMainMessage();
}
}
$_SESSION['errors'] = $this->errors;
return $this;
}
I've seen some responses before but some are very hard to grasp for me as I don't intend on doing a whole translation of the library. I'm just attempting to write 5 or 6 custom messages.
EDIT: A method using the messages:
$validation = $this->c->validator->validate($request, [
'username' => v::noWhitespace()->notEmpty()->usernameAvailable(),
'email' => v::noWhitespace()->notEmpty()->email()->emailAvailable(),
'password1' => v::noWhitespace()->notEmpty(),
'password2' => v::noWhitespace()->notEmpty()->identical($inputPassword),
]);

Answer 1

Using findMessages with the parameter you're translating the messages. You just have to replace the content in the catch block:
catch (NestedValidationException $e) {
$errors = $e->findMessages([
'usernameAvailable' => '{{name}} ya existe en la base de datos',
'emailAvailable' => '{{name}} ya existe en la base de datos',
'notEmpty' => '{{name}} no puede estar vacío',
'noWhitespace' => '{{name}} no puede contener espacios',
'email' => '{{name}} debe contener un e-mail válido'
]);
$filteredErrors = array_filter($errors); // Ensure the array is not containing empty values
$this->$errors[$field] = $filteredErrors;
}