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GetSimple supports different languages for the admin panel. Download the latest language files for GetSimple from Extend.
Once you've downloaded the language file of your choosing, save it to the /admin/lang/
folder of your new installation of GetSimple. If you've already gone through the setup of GetSimple, you can change your language preference within your Settings tab.
Experimental (for plugins conforming to the guidelines and GetSimple itself):
There are functions and standards to internationalize (i18n) plugins. Check them out here.
CKEditor also supports languages.