Bug fixes

• Add missing return value for link post-fixer. Closes #241. (14e5803)
• Improved balloon positioning when there is more than one stack in the rotator. (d6c45df)
• The UI buttons should be marked as toggleable for better assistive technologies support (see ckeditor/ckeditor5#1403). (b9e31a0)

Other changes

• The issue tracker for this package was moved to https://github.com/ckeditor/ckeditor5/issues. See ckeditor/ckeditor5#1988. (cea8fa2)
• Passed editor content direction to the bindTwoStepCaretToAttribute() helper in the LinkEditing plugin. See ckeditor/ckeditor5#1151. (73bf132)
• Updated translations. (4345546)