[kcms/translations] Be more consistent with inline remove buttons

To be consistent with what we generally do in other places, use the
trashcan icon for the remove button, and only show it when the list has
more than one item in it.

BUG: 437567
BUG: 437566
FIXED-IN: 5.22


(cherry picked from commit c6c4c9adf5)

kcms/translations/package/contents/ui/main.qml

@@ -281,7 +281,8 @@ ScrollViewKCM {
                 Kirigami.Action {
                     property bool removing: false
                     enabled: removing || !model.IsMissing
-                    iconName: "list-remove"
+                    iconName: "edit-delete"
+                    visible: languagesList.count > 1
                     tooltip: i18nc("@info:tooltip", "Remove")
                     onTriggered: {
                         removing = true; // Don't crash by re-evaluating `enabled` during destruction.