How do I specify the interface language for CKEditor (jquery version)?

Try this:

$('textarea').ckeditor({language: 'de'});

Untested, but check this out:

http://www.sayopenweb.com/ckeditor-faq/

Q. How do i set language for CKEditor for achieving localization?

A. Use language property for setting the language of CKEditor. By using this property CKEditor menu’s and labels will display the localized language.

CKEditor.replace('divcomponentid', {
        language: 'ja'
})

And if you are using custom config file for creating CKEditor instance use,

CKEditor.editorConfig = function(config) {
    language = "ja";
};

Even one can use javascript variable to set language file to make localization option dynamic.

If you are using custom config file for creating CKEditor instance try this.

config

I found an easy way to set up your language to CKE 4 editor :

 1. Go to config.js -> 
 2. Then change this line in config.js ->
 3. config.language = "en"

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