is getString() returning translated content?
you can check translation with something like 

if ($entity-&gt;get('field_anc_label')-&gt;getFieldDefinition()-&gt;isTranslatable()) {
  // The field translation is enabled.
$links['node']['#links']['node-readmore']['attributes']['title'] = $entity-&gt;field_anc_label-&gt;getString();
}else{
$links['node']['#links']['node-readmore']['attributes']['title'] = 
t($entity-&gt;field_anc_label-&gt;getString());
}