Rename "logout" things to "sign out" + update icon

src/qml/Dialogs/ExportKeys.qml

@@ -12,7 +12,7 @@ HFileDialogOpener {
     }
 
 
-    // This is used for the LogoutPopup to know when the export is done
+    // This is used for the SignOutPopup to know when the export is done
     // so it can close
     signal done()
 

src/qml/Popups/SignOutPopup.qml

@@ -18,7 +18,7 @@ BoxPopup {
     box.focusButton: "ok"
     box.buttonModel: [
         { name: "ok", text: qsTr("Export keys"), iconName: "export-keys" },
-        { name: "signout", text: qsTr("Sign out now"), iconName: "logout",
+        { name: "signout", text: qsTr("Sign out now"), iconName: "sign-out",
           iconColor: theme.colors.middleBackground },
         { name: "cancel", text: qsTr("Cancel"), iconName: "cancel" },
     ]

src/qml/SidePane/AccountDelegate.qml

@@ -107,11 +107,11 @@ HTileDelegate {
 
     contextMenu: HMenu {
         HMenuItem {
-            icon.name: "logout"
+            icon.name: "sign-out"
             icon.color: theme.colors.negativeBackground
-            text: qsTr("Logout")
+            text: qsTr("Sign out")
             onTriggered: Utils.makePopup(
-                "Popups/LogoutPopup.qml",
+                "Popups/SignOutPopup.qml",
                 mainUI,
                 { "userId": model.data.user_id },
                 popup => { popup.ok.connect(() => { disconnecting = true }) },