Update a couple buttons to use correct markup (#11926)

app/assets/javascripts/admin/addon/controllers/modals/admin-merge-users-confirmation.js

@@ -22,6 +22,13 @@ export default Controller.extend(ModalFunctionality, {
     });
   },
 
+  @discourseComputed("username")
+  mergeButtonText(username) {
+    return I18n.t(`admin.user.merge.confirmation.transfer_and_delete`, {
+      username,
+    });
+  },
+
   @discourseComputed("value", "text")
   mergeDisabled(value, text) {
     return !value || text !== value;

app/assets/javascripts/admin/addon/controllers/modals/admin-merge-users-prompt.js

@@ -1,4 +1,5 @@
 import Controller, { inject as controller } from "@ember/controller";
+import I18n from "I18n";
 import ModalFunctionality from "discourse/mixins/modal-functionality";
 import { action, get } from "@ember/object";
 import { alias } from "@ember/object/computed";
@@ -17,6 +18,13 @@ export default Controller.extend(ModalFunctionality, {
     return !targetUsername || username === targetUsername;
   },
 
+  @discourseComputed("username")
+  mergeButtonText(username) {
+    return I18n.t(`admin.user.merge.confirmation.transfer_and_delete`, {
+      username,
+    });
+  },
+
   @action
   showConfirmation() {
     this.send("closeModal");