"Be careful if you install an update because it may overwrite your own language and bring your JCE back to English language"
JCE 2.3 includes a new method for translating JCE dialogs, which require new language packs. Our translators are working hard to finish these, one may already be available for you - http://www.joomlacontenteditor.net/downloads/languages
"I do not recommend JCE if you have to put code in an article or module, it could insert something you don't want"
Many thanks to the developer!