display team count (#648)

## Description:
I added a display for the number of teams in public lobbies.
![スクリーンショット 2025-05-04 20 59
02](https://github.com/user-attachments/assets/ab24de77-fcac-4c2d-b272-2bc3ce29187f)
## Please complete the following:

- [x] I have added screenshots for all UI updates
- [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:

aotumuri

resources/lang/en.json

@@ -145,7 +145,8 @@
   },
   "public_lobby": {
     "join": "Join next Game",
-    "waiting": "players waiting"
+    "waiting": "players waiting",
+    "teams": "Team count:"
   },
   "username": {
     "enter_username": "Enter your username",

resources/lang/ja.json

@@ -137,7 +137,8 @@
   },
   "public_lobby": {
     "join": "次のゲームに参加",
-    "waiting": "人が参加しています..."
+    "waiting": "人が参加しています...",
+    "teams": "チームの数:"
   },
   "username": {
     "enter_username": "ユーザー名を入力",

src/client/PublicLobby.ts

@@ -94,6 +94,11 @@ export class PublicLobby extends LitElement {
     const playersRemainingBeforeMax =
       lobby.gameConfig.maxPlayers - lobby.numClients;
 
+    const teamCount =
+      lobby.gameConfig.gameMode === GameMode.Team
+        ? lobby.gameConfig.playerTeams || 0
+        : null;
+
     return html`
       <button
         @click=${() => this.lobbyClicked(lobby)}
@@ -130,6 +135,13 @@ export class PublicLobby extends LitElement {
                   ? translateText("game_mode.teams")
                   : translateText("game_mode.ffa")}
               </div>
+              ${teamCount !== null
+                ? html`
+                    <div class="text-md font-medium text-blue-100">
+                      ${translateText("public_lobby.teams")} ${teamCount}
+                    </div>
+                  `
+                : null}
             </div>
             <div class="flex flex-col items-center">
               <div class="text-md font-medium text-blue-100 mb-2">