Terminology fix: "invite members" → "invite users"

What we're inviting to a room is users that aren't members yet

src/gui/MainPane/RoomDelegate.qml

@@ -139,7 +139,7 @@ HTile {
             visible: joined
             enabled: model.can_invite && accountModel.presence !== "offline"
             icon.name: "room-send-invite"
-            text: qsTr("Invite members")
+            text: qsTr("Invite users")
 
             popup: "Popups/InviteToRoomPopup.qml"
             properties: ({

src/gui/Pages/Chat/RoomPane/MemberView/MemberView.qml

@@ -155,8 +155,8 @@ HColumnLayout {
 
                     toolTip.text:
                         enabled ?
-                        qsTr("Invite members to this room") :
+                        qsTr("Invite users to this room") :
-                        qsTr("No permission to invite members to this room")
+                        qsTr("No permission to invite users to this room")
 
                     onClicked: window.makePopup(
                         "Popups/InviteToRoomPopup.qml",

src/gui/Popups/InviteToRoomPopup.qml

@@ -68,7 +68,7 @@ HColumnPopup {
         if (! invitingAllowed && inviteFutureId) py.cancelCoro(inviteFutureId)
 
     SummaryLabel {
-        text: qsTr("Invite members to <i>%1</i>").arg(roomName)
+        text: qsTr("Invite users to <i>%1</i>").arg(roomName)
         textFormat: Text.StyledText
     }
 
@@ -137,7 +137,7 @@ HColumnPopup {
         text:
             invitingAllowed ?
             allErrors :
-            qsTr("You do not have permission to invite members to this room")
+            qsTr("You do not have permission to invite users to this room")
 
         Layout.maximumHeight: text ? implicitHeight : 0
         Layout.fillWidth: true