How do I retrieve a plugin block field's translated value?
Little did I know, the translation was correctly loaded, but not used in the twig files. Both the fields' content and configuration were loaded, were content was ie an image and a link, and configuration the field's translation.
Somehow, still, the configuration needed several cache rebuilds to show up, but then went ok and kept being updated if I made any modifications.
The twig files were using variables such as {{ content['field_worldwide_text'] }}, so I needed it to use config[] instead.
Additional notes for future self, here is how to load content and configuration:
$content = $this-&gt;blockConfigFactory-&gt;getBlockConfig($this-&gt;getPluginId());
$config = $this-&gt;getConfiguration();