Update name censor to check for certain substrings (#3603)

## Description:

The deduper was converting profane words like "kkk" => "k" and then
censoring all usernames with the letter "k", so instead we just hardcode
and check for substrings for profane phrases like that.

## 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

tests/Privilege.test.ts

@@ -131,6 +131,13 @@ describe("UsernameCensor", () => {
       // "snigger" is whitelisted in englishDataset
       expect(matcher.hasMatch("snigger")).toBe(false);
     });
+
+    test("catches kkk as substring", () => {
+      expect(matcher.hasMatch("kkk")).toBe(true);
+      expect(matcher.hasMatch("KKK")).toBe(true);
+      expect(matcher.hasMatch("kkklover")).toBe(true);
+      expect(matcher.hasMatch("ilovekkkboys")).toBe(true);
+    });
   });
 
   describe("censorUsername", () => {
@@ -186,6 +193,15 @@ describe("UsernameCensor", () => {
         expect(checker.censorUsername("[NAZI]CoolPlayer")).toBe("CoolPlayer");
       });
 
+      test("removes [SS] clan tag", () => {
+        expect(checker.censorUsername("[SS]Player")).toBe("Player");
+        expect(checker.censorUsername("[ss]Player")).toBe("Player");
+      });
+
+      test("removes [KKK] clan tag", () => {
+        expect(checker.censorUsername("[KKK]Player")).toBe("Player");
+      });
+
       test("keeps clean clan tag when username is clean", () => {
         expect(checker.censorUsername("[COOL]Player")).toBe("[COOL] Player");
         expect(checker.censorUsername("[PRO]Player")).toBe("[PRO] Player");