Localize Users Content

Currently there is no functionallity to get content created by user localized to currently selected language. So my idea is, to create a related table in DB to keep content depending on the selected language. When switching to an other language, initially the content is empty. When editig the content, there should be a button, to display a dialog with a field for the default content and a field for the content to translate. Translated content should be saved then to the related table with the language id.