Typo error in word balloon

[dinhkhanh]

Describe the bug
In the whole code base, including file/folder name, the world balloon has typo error, as baloon. This causes issues in custom config in /config/ckeditor.txt if people type it corrrectly as toolbarBalloon or blockBalloon.

Expected behavior
The world baloon should be balloon, in directory / file name, and in variable / function name.