Roadmap of Language Service

Already Implemented

• Accelerated language update (no more need to introduce background tasks)
• Removed language installation in config (only English is installed by Setup)
• Substituted LegacyUI Button by KS Button in the folder GUI's toolbar (ilObjLanguageFolderGUI); the form action buttons in ilObjLanguageExtGUI (addCommandButton()) are still legacy ilPropertyFormGUI buttons
• Migrated the component to the Component Revision's dependency graph ($define/$implement/$use/$contribute/$seek/$provide/$pull/$internal in Language.php) and introduced the Activities pattern: seven ILIAS\Language\Activities\* classes now hold this component's install/update/uninstall/detection/translation-toggle/entry-editing logic, used by the GUI classes via maybePerformAs() - see the README's "Activities" section
• Extracted language-installation state access into InstalledLanguageRepository and LanguageInstallationManager (repository pattern), and language-file-directory resolution into ILIAS\Language\ComponentTranslation\* - see the README
• Plural forms for modules maintained in PO files: txt($a_topic, $n), Plural-Forms evaluated by ILIAS\Language\ComponentTranslation\PluralForms (pilot modules tos and poll, see Translations Maintained in PO Files)

Short Term

• Fixing PHP 8.2 issues
• Analysing use of language variables on test9
• GitHook for preventing duplicate use of same variable_ID in language files
• Migrate the remaining addCommandButton() form buttons in ilObjLanguageExtGUI to KS Button
• Take the system settings of SetLanguageDetectionEnabled/SetLanguageTranslationEnabled from the dependency graph as soon as Administration offers them there; until then LanguageSettingsLegacyProxy reads them from the legacy container
• Let the GUI classes get the Activities by dependency injection once ilCtrl allows it, and drop the Activities and the LanguageFileDirectoryManager from the legacy $DIC (AllModernComponents)
• Build lng in the dependency graph instead of ilInitialisation::initLanguage()
• Replace hand-made singular/plural key pairs by plural messages and txt($a_topic, $n) together with the owning components (first proposal: Poll)

Mid Term

• Move LegacyUI Table2GUI to KS Data Table - ilLanguageFolderTable and ilLanguageStatisticsTable already implement the KS DataRetrieval table; only ilLanguageExtTableGUI (still extends ilTable2GUI, used by ilObjLanguageExtGUI::getViewTable()) remains to be migrated
• Remove unused language variables from language files
• Improving export and import of customised language files
• Improving online translation tool

Long Term

• Introducing RFC 5646 language coding scheme for language and region to allow multiple versions per language, see https://datatracker.ietf.org/doc/html/rfc5646
• Separating language service from language files