Problem/Motivation
* @param string $cache_key
* Cache key prefix to use, the language code will be appended
* automatically.I can't find anything that would append the language code. I can find, however, three plugin managers doing
<?php
$this->setCacheBackend($cache_backend, 'contextual_links_plugins:' . $language_manager->getCurrentLanguage()->getId(), array('contextual_links_plugins'));
$this->setCacheBackend($cache_backend, 'local_action_plugins:' . $language_manager->getCurrentLanguage()->getId(), array('local_action'));
$this->setCacheBackend($cache, 'local_task_plugins:' . $language_manager->getCurrentLanguage()->getId(), array('local_task'));
?>so either these three are wrong or the doxygen is wrong.