IBX-10261: Enabled special characters plugin in CKE (#246)

Author: dew326

src/bundle/Resources/config/prepend/ezpublish.yaml

@@ -63,6 +63,8 @@ system:
                                 priority: 20
                             ibexaCustomAttributes:
                                 priority: 10
+                            specialCharacters:
+                                priority: 5
                     group5:
                         priority: 20
                         buttons:

src/bundle/Resources/public/js/CKEditor/core/base-ckeditor.js

@@ -28,6 +28,8 @@ import Subscript from '@ckeditor/ckeditor5-basic-styles/src/subscript';
 import Superscript from '@ckeditor/ckeditor5-basic-styles/src/superscript';
 import Strikethrough from '@ckeditor/ckeditor5-basic-styles/src/strikethrough';
 import BlockQuote from '@ckeditor/ckeditor5-block-quote/src/blockquote';
+import SpecialCharacters from '@ckeditor/ckeditor5-special-characters/src/specialcharacters';
+import SpecialCharactersEssentials from '@ckeditor/ckeditor5-special-characters/src/specialcharactersessentials';
 import ContextualBalloon from '@ckeditor/ckeditor5-ui/src/panel/balloon/contextualballoon';
 
 const VIEWPORT_TOP_OFFSET = 102;
@@ -171,6 +173,8 @@ const VIEWPORT_TOP_OFFSET_DISTRACTION_FREE_MODE = 0;
                     Superscript,
                     Strikethrough,
                     BlockQuote,
+                    SpecialCharacters,
+                    SpecialCharactersEssentials,
                     ContextualBalloon,
                     IbexaCharacterCounter,
                     IbexaElementsPath,