Hi NateS, basically our extension was created to be able to translate all the parts of flarum that are not translatable by default. This is mainly the names of tags, as they are usually saved in the database. With our extension, you get a dynamically created translation key for each tag name and description.
As you can see in the original post, there is a full list of all the other parts of flarum and of third party extensions that are supported by Localizd.
