incomingcallpage: translate "is calling you"

Change-Id: If6ad1b33f7a6636ad72d86103b4d314792e315ff
Gitlab: #419

src/constant/JamiStrings.qml

@@ -179,6 +179,7 @@ Item {
     property string isRecording: qsTr("is recording")
     property string areRecording: qsTr("are recording")
     property string peerStoppedRecording: qsTr("Peer stopped recording")
+    property string isCallingYou: qsTr("is calling you")
 
     // CallOverlayButtonGroup
     property string mute: qsTr("Mute")

src/mainview/components/IncomingCallPage.qml

@@ -75,7 +75,7 @@ Rectangle {
             verticalAlignment: Text.AlignVCenter
             color: "white"
 
-            text: "is calling you"
+            text: JamiStrings.isCallingYou
         }
 
         RowLayout {