Add button for remove building (#1609)

## Description:

Added a red delete button with trash can icon to the right-click radial
menu that allows players to voluntarily delete their own units.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I have read and accepted the CLA agreement (only required once).

## Please put your Discord username so you can be contacted if a bug or
regression is found:

Kipstz

<img width="286" height="209" alt="image"
src="https://github.com/user-attachments/assets/85142be3-2aa5-4c84-ab30-0c68289c8f85"
/>

---------

Co-authored-by: Drills Kibo <59177241+drillskibo@users.noreply.github.com>

resources/lang/en.json

@@ -502,7 +502,8 @@
     "accept_alliance": "Accept",
     "reject_alliance": "Reject",
     "alliance_renewed": "Your alliance with {name} has been renewed",
-    "ignore": "Ignore"
+    "ignore": "Ignore",
+    "unit_voluntarily_deleted": "Unit voluntarily deleted"
   },
   "unit_info_modal": {
     "structure_info": "Structure Info",
@@ -608,5 +609,9 @@
     "redirecting": "You are being redirected...",
     "not_authorized": "You are not authorized to access this website.",
     "contact_admin": "If you believe you are seeing this message in error, please contact the website administrator."
+  },
+  "radial_menu": {
+    "delete_unit_title": "Delete Unit",
+    "delete_unit_description": "Click to delete the nearest unit"
   }
 }