Bump ckeditor4 from 4.14.0 to 4.18.0

Bumps [ckeditor4](https://github.com/ckeditor/ckeditor4-releases) from 4.14.0 to 4.18.0.
- [Release notes](https://github.com/ckeditor/ckeditor4-releases/releases)
- [Changelog](https://github.com/ckeditor/ckeditor4-releases/blob/master/CHANGES.md)
- [Commits](https://github.com/ckeditor/ckeditor4-releases/compare/4.14.0...4.18.0)

---
updated-dependencies:
- dependency-name: ckeditor4
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -17,7 +17,7 @@
     "bootstrap": "~4.3",
     "bootstrap-sass": "^3.4.1",
     "bootstrap3": "npm:bootstrap@~3.4",
-    "ckeditor4": "4.14.0",
+    "ckeditor4": "4.18.0",
     "cookieconsent": "^3.1.0",
     "cross-env": "^5.1.6",
     "eonasdan-bootstrap-datetimepicker": "^4.17.47",