Runlight displayed using the browser language instead of the current Drupal language. For example, a Drupal installation set in English (most of the Drupal sites are set using only English), if I use a French browser, the Runlight dashboard is displayed in French. Runlight also support only 5 languages (available in the footer)
Install Runlight and see that Runlight uses its own translation mechanism. It uses a language set in the footer and also detects the browser language.
While I understand that Runlight supports multiple environments and that the main Runlight components are loaded through a composer package, let's see if we can use Drupal localization mechanism for this project.
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