You will find here the list of installed languages available for your administration profile and for your blog. Each of these languages can be removed.
In the case where no language would be present, English would be used by default for the administration part as well as for the blog.
You will find here a list of languages available on Dotclear website. To install one of these languages, select it in the dropdown list, enter your password and press Install language.
The selected language will then be downloaded and installed on your system.
You can also use a compressed archive (zip format) to install a language. Select the corresponding file on your computer, enter your password and press Upload language.