Add close label (#949)

## Description:
Add a label to the close button on News modal. Closes
[#947](https://github.com/openfrontio/OpenFrontIO/issues/947)

## 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 understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

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


![image](https://github.com/user-attachments/assets/35500890-a30a-4481-aa73-802152325eef)

resources/lang/en.json

@@ -5,6 +5,9 @@
     "svg": "uk_us_flag",
     "lang_code": "en"
   },
+  "common": {
+    "close": "Close"
+  },
   "main": {
     "title": "OpenFront (ALPHA)",
     "join_discord": "Join the Discord!",