Language Plugins
The core TiddlyWiki user interface is available in over 20 languages. You can install language plugins following the instructions Installing a plugin from the plugin library. You can change the current language using the language button, found on the "Tools" tab in the sidebar.
You can contribute a new language to the library by learning how to translate TiddlyWiki into your language.
Language Editions
For some languages, there are pre-built editions with additional translated documentation: