plugins/runcommand: make config dialog HIG-compliant

The HIG recommend that buttons with an action label that require further
user input end in an ellipsis, and that dialog buttons should clearly
indicate what they do. Button labels typically do not match the given
exceptions that license sentence case. Currently, the main "Add command"
button in the configuration button does not end in an ellipsis even
though it opens a dialog, is sentence case, and the dialog has a "Save"
rather than the customary "Add" that is used for these kinds of actions,
in particular in kcms. The dialog title is also not translatable.

This change adds the ellipsis, converts the button to title case, makes
the dialog title translatable, and adds an "Add" button as an action to
the dialog.

plugins/runcommand/kdeconnect_runcommand_config.qml

@@ -22,7 +22,7 @@ ListView {
 
     property var action: Kirigami.Action {
         icon.name: "list-add"
-        text: i18n("Add command")
+        text: i18n("Add Command…")
         onTriggered: addDialog.open()
     }
 
@@ -58,11 +58,27 @@ ListView {
 
     Kirigami.Dialog {
         id: addDialog
-        title: "Add command"
+        title: i18nc("@title:window", "Add Command")
 
-        standardButtons: QQC2.Dialog.Save | QQC2.Dialog.Cancel
         padding: Kirigami.Units.largeSpacing
 
+        property Kirigami.Action addCommandAction: Kirigami.Action {
+            text: i18nc("@action:button", "Add")
+            icon.name: "list-add"
+            enabled: commandField.length > 0
+            onTriggered: {
+                commandModel.addCommand(nameField.text, commandField.text)
+                addDialog.close();
+            }
+            Component.onCompleted: {
+                // TODO: can be set directly once Qt 6.8 is required
+                Accessible.Name = i18nc("@action:button accessible", "Add command")
+            }
+        }
+
+        standardButtons: Kirigami.Dialog.Cancel
+        customFooterActions: [addCommandAction]
+
         Kirigami.FormLayout {
             QQC2.TextField {
                 id: nameField
@@ -115,7 +131,5 @@ ListView {
                 }
             }
         }
-
-        onAccepted: commandModel.addCommand(nameField.text, commandField.text)
     }
 }