The translation for tool title and descriptions are in the config directory tools.properties files which is located in this directory in the latest version of Sakai.
Sakai 2.8 had the same pattern for translation but it's recommended that you use a more updated version of Sakai. You'd have to rebuild this config project and redeploy an updated jar to have it pick up the translations.
Most of the translation for Sakai now is being done on crowdin at https://crowdin.net/project/sakai-cle