Add Italian translation for some "editor" plugins

Italian translations for plugins:
* 'editor.ajxp_role'
* 'editor.audio'
* 'editor.browser'
* 'editor.ckeditor'
* 'editor.codemirror'
* 'editor.codepress'
* 'editor.diaporama'
* 'editor.eml'
* 'editor.etherpad'
* 'editor.exif'