Project loses encoding after rename global vars

After renaming global variable in IDE

and saving all, the whole project loses its encoding. (Vars must be used in project)

**OS (**Windows 10)

Katalon Studio Version (5.3.1)

2018-04-03_143716.png

2018-04-03_140621.png

Bug is actual in Katalon Studio 5.4.0 build 1 Windows 7