[FEATURE REQ] URL parameter selects language

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/?area_id=int&room_id=silo&lang=it -> Spawn character in International server's Silo with Italian language software.

Similar to how area_id selects the "server" and room_id selects the "room, lang should select a language based on either filename in static/scripts/lang (eg: en, ja, es) or lang_name url-encoded (eg 繁體中文（臺灣） -> %E7%B9%81%E9%AB%94%E4%B8%AD%E6%96%87%EF%BC%88%E8%87%BA%E7%81%A3%EF%BC%89 )