[Client] Item Set construction doesn't properly label items' map availability

When item sets were first created, each item had a correct label at the bottom detailing which maps they were unavailable on. Now, they only mark unavailability on Crystal Scar, making it much more difficult to determine at a glance where each item can be found.

Additionally, when sorting items by map on the Items section of the website, clicking Summoner's Rift shows zero items regardless of what else may be selected or searched.

On a related note, while this point is not technically a bug, I would like to request that a much more in-depth look be made into which items actually are available on each map. In particular, Twisted Treeline's lack of Bloodthirster, Essence Reaver, and Thornmail is unhealthy with regard to the selection of viable champions for play there.

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Full set of my unresolved bug report threads:

• Match History still calls north team "Purple"
• Team Builder lobby doesn't dissolve if an invited player disconnects
• Zyra passive can't be fired with an unranked ability's key
• Ahri R should start cooldown upon death
• Targeted abilities sometimes fizzle if their target moves away
• Storm Shield relics on Crystal Scar can be displaced
• Orianna's Ball may return while distance indicator is still yellow
• "Enable HUD animations" does nothing; "Disable minimap movement" ignores some input
• Galio W doesn't provoke heal from Twitch passive
• Teemo passive prevents capture of a neutral Twisted Treeline altar
• Anivia passive doesn't trigger if killed by Razorfins
• Vilemaw death timer not appearing
• Item Set construction doesn't properly label items' map availability
• Removed items are still displayed in Item Sets
• Zyra passive on quick cast is erratic
• Zyra can use trinket while in passive
• Inactive Heimerdinger turrets not damaged by Rift Herald

I will be bumping these threads periodically, though in a way that avoids flooding.