Polish voice call UI

resources/icons/ui/end-call.png

resources/icons/ui/microphone-mute.png

resources/icons/ui/microphone-unmute.png

resources/icons/ui/place-call.png

resources/res.qrc

src/ActiveCallBar.cpp

src/ActiveCallBar.h

src/CallManager.cpp

src/CallManager.h

src/ChatPage.cpp

src/TextInputWidget.cpp

src/TextInputWidget.h

src/WebRTCSession.cpp

src/WebRTCSession.h

src/dialogs/AcceptCall.cpp

src/dialogs/AcceptCall.h

src/dialogs/PlaceCall.cpp

src/dialogs/PlaceCall.h