Language fixes, more elytra fixes, dashboard polish

• New force_server_language option, makes everyone see the server's chosen language instead of their own client locale
• GUI menus, item names and lores now actually translate
• Replay viewer, staff alerts, web pair messages and join notices now translate too
• Jesus, NoClip packet check and Protocol check stop firing during elytra flight
• Firework rocket use is now tracked so every check sees the boost grace window
• Run now button on the dashboard analytics page, triggers auto-tune against current FP history on demand