api output attrib on regional lang

hi all,

On my Icinga server display_name host or service write on Russian lang.

When i see it host or services name on IcingaWeb, i see it correct.

When i try curl or powershell api request
display_name Russian letters is not displayed correctly

example:
Icinga Web - Сайт www.rosconcept.ru
curl - "\u0421\u0430\u0439\u0442 www.rosconcept.ru"
powelshell - Сайт www.rosconcept.ru

what you need to do for correct display Russian names?