frontend: utf16 -> utf8

titles/ongeki/frontend.py

@@ -64,7 +64,7 @@ class OngekiFrontend(FE_Base):
                 version_list=self.version_list,
                 version=self.version,
                 sesh=vars(usr_sesh)
-            ), media_type="text/html; charset=utf-16")
+            ), media_type="text/html; charset=utf-8")
         else:
             return RedirectResponse("/gate/", 303)