https://www.drupal.org/node/1323152
Added ability to use contexts in Drupal.t() and Drupal.formatPlural | Drupal.org
Oct 19, 2022 - This was unfortunately not done in time for the release of Drupal 7.0, so while you can use string context values in t() to designate a specific meaning of a...
addedabilityusecontexts