Scheduler Event Calendar Localization

Override scheduler toolbar and overlay strings for localization.

• French, English, or custom label sets on calendar chrome
• Product copy that differs from default English strings

• Provide SchedulerLocaleText through SchedulerChromeContext or the locale_text prop.
• Wrap pickers in DatetimeLocale when editing uses Calendar & Time components.
• Switch locale by updating the locale text signal — toolbar labels react immediately.