Fix infinite loop in RandomWord

src/game/language.ts

@@ -226,7 +226,7 @@ export class RandomWord extends Word {
 
     do {
       choice = Math.floor(Math.random() * this.choices.length)
-    } while (choice === this.history.last)
+    } while (choice === this.history.last && this.choices.length > 1)
 
     this.history.last = choice
     return this.choices[choice].configure(this.opt).toString()