add not logged in warning to flags modal, refactored to its own lit component (#3521)

## Description:

So players know they are logged out and don't think their purchased
flags dissappeared.

## 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

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

evan

resources/lang/en.json

@@ -6,6 +6,7 @@
     "lang_code": "en"
   },
   "common": {
+    "not_logged_in": "Not logged in",
     "close": "Close",
     "copy": "Copy",
     "paste": "Paste",
@@ -912,7 +913,6 @@
   "territory_patterns": {
     "title": "Skins",
     "purchase": "Purchase",
-    "not_logged_in": "Not logged in",
     "pattern": {
       "default": "Default"
     },