How to get term ID from translated term name?
A suggestion :

$my_translated_term_name = 'astuce';

$query = \Drupal::database()-&gt;select('taxonomy_term_field_data', 'td');
$query-&gt;addField('td', 'tid');
$query-&gt;condition('td.name', $my_translated_term_name);
// For better performance, define the vocabulary where to search.
// $query-&gt;condition('td.vid', $vid);
$term = $query-&gt;execute();

$tid = $term-&gt;fetchField();