Update for fixed variable name. (#957)

Closes #956

Author: microbit-matt-hillsdon

lang/ui.ko.json

@@ -228,7 +228,7 @@
     "description": "Button text for delete action"
   },
   "delete-file-action": {
-    "defaultMessage": "{filename} 삭제",
+    "defaultMessage": "{name} 삭제",
     "description": "Menu option to delete file"
   },
   "deleted-file": {

src/messages/ui.ko.json

@@ -470,7 +470,7 @@
   "delete-file-action": [
     {
       "type": 1,
-      "value": "filename"
+      "value": "name"
     },
     {
       "type": 0,