`config/trst.rb` Rack::SessionCookie expire_after 12hours
assets: js, handle expired session
i18n: `trst.yml` new translation, `msg.session.reload`
update CHANGELOG
bump version v0.2.12
Merge branch 'hotfix/v0.2.12'
Merge tag 'v0.2.12' into develop

Hotfix c0.2.12, session expire 12 hours