fix: WCAG fastpass

src/language/en-US.json

@@ -30,6 +30,10 @@
         "verifyFailed": "Verification failed",
         "loginFailed": "Login failed",
         "loginSuccess": "Login success!"
+      },
+      "toolbar": {
+        "toggleTheme": "Toggle theme",
+        "selectLocale": "Select language"
       }
     }
   }

src/language/zh-TW.json

@@ -30,6 +30,10 @@
         "verifyFailed": "驗證失敗",
         "loginFailed": "登入失敗",
         "loginSuccess": "登入成功！"
+      },
+      "toolbar": {
+        "toggleTheme": "切換主題",
+        "selectLocale": "選擇語系"
       }
     }
   }