Issue #2321583 by Wim Leers, DuaelFr: Update CKEditor library to 4.5.5

core/assets/vendor/ckeditor/CHANGES.md

core/assets/vendor/ckeditor/ckeditor.js

core/assets/vendor/ckeditor/lang/eu.js

core/assets/vendor/ckeditor/lang/id.js

core/assets/vendor/ckeditor/lang/ug.js

core/assets/vendor/ckeditor/lang/uk.js

...ssets/vendor/ckeditor/plugins/a11yhelp/dialogs/lang/eo.js

...ssets/vendor/ckeditor/plugins/a11yhelp/dialogs/lang/eu.js

...ssets/vendor/ckeditor/plugins/a11yhelp/dialogs/lang/fr.js

...ssets/vendor/ckeditor/plugins/a11yhelp/dialogs/lang/ru.js

...ssets/vendor/ckeditor/plugins/a11yhelp/dialogs/lang/uk.js

...assets/vendor/ckeditor/plugins/clipboard/dialogs/paste.js

...ts/vendor/ckeditor/plugins/specialchar/dialogs/lang/eu.js

...ts/vendor/ckeditor/plugins/specialchar/dialogs/lang/pl.js

core/core.libraries.yml