Calendar, League club gallery, and prep for Live games

Just when you think the UI is more or less done, another update lands.

• FEATURE New Calendar added under Office in the left menu — originally on the roadmap, and also reported today by #plastmasinis_agurkas
• FEATURE League club gallery added (League → Clubs tab) — check it out, e.g. EU.1
• FEATURE League schedule tab added to the Club page
• CHANGE Tactics can now only be set up to 15 minutes before kickoff — a first step toward Live games
• FIX Active sessions are now invalidated when a player's team turns into a bot team — thanks @chanceler

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