Menu cleanup

	RESTRICTED
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Removed & relocated

• File → Import — will only exist in the Bookmarks window
• File → Close Window — already in the UI
• File → Close Tab — already in the UI
• Edit → Find Again — already in the Find bar
• Tools → Web Search — already in the UI
• File → Work offline — no longer necessary, since it now autodetects whether we're online/offline
• File → Send link — put in the URL bar
• File → Save Frame As — is already in the context menu
• File → Open Location — already in the UI
• Edit → Delete — has a key ;)
• Bookmarks → Subscribe to this page