[bootstrap4] Word `Empty` on sort icon

[parallels999]

This happens in bootstrap 4

This commit is causing the problem https://github.com/tonytomov/jqGrid/commit/bcdac3955f5180efdfd6990d94fb074bc4ae5c2d

shows empty even if one of the 2 options is selected(asc, desc)

[tonytomov]

Hello,

Can you please prepare a working example with the problem? Thank you

[parallels999]

Done https://jsfiddle.net/jcmg6v2a/1/