I've (programmatically) created a custom module which includes a block with a string wrapped in the $this->t() function. How or where can I extract this translation file?
In Drupal 7 I would extract a translation file of the custom module, but the POTX module is not ported to Drupal 8 yet.
public function build() {
return array(
'#markup' => $this->t('How and where can I translate this string?'),
);
}