Add submission archives

Delete EN/RU support

Add translation for column and tab names

Add RU/EN versions of leaderboard. Extend datasets description

Fix leaderboard view and results saving

Fix last submit view

Fix main board

Update leaderboard

Add zip submission flow and unify pass@1 and Exact match metrics.

Add MERA Reason leaderboard with four benchmarks and datasets tab.

Duplicate from gradio-templates/leaderboard