I am trying to write up a patch for this module: https://www.drupal.org/project/readmore. There is a patch for it: https://www.drupal.org/project/readmore/issues/3055200 which adds configurable text for the "read more" and "read less" links provided by this field formatter. But the configuration for these new settings are not translatable.
I noticed that the readmore.schema.yml did not include entries for these new fields (although the new configuration options do work). I added this:
label: 'Read more link text'
label: 'Read less link text'
To the .schema file but it doesn't help.
What is missing to trigger translation of this view to show these new configuration options?