Small fixes for nicknames, gifts, copying from history and more

Nicknames can now use Hangul. Student discount verification now accepts email addresses from universities that do not use an ac.jp domain.

A coin gift you cannot accept because your balance is at the cap now stays in your gift box instead of disappearing. The unclaimed count also updates correctly right after you claim a gift.

We fixed Copy in the history menu sometimes not responding, blog likes not being saved, and logout being triggered twice. Times in play history and at tables are now shown in your local time.