feat(a11y): announce dynamic location in Santa tracker button

[KenTandrian]

This PR fixes an accessibility issue where the "Santa image" button only announced "Santa Claus" without providing context about his current location or status. Screen reader users would land on the button but receive no useful information about where Santa currently is in the world.

Changes

• Dynamic Location Announcement: Updated SantaSantaElement to accept a locationLabel property and dynamically update the button text.
• Contextual Phrasing: Implemented logic to distinguish between Santa's states:
  • "Santa Claus is at [Location]" when stopped.
  • "Santa Claus is heading to [Location]" when moving.
• Data Integration: Modified ModvilTrackerElement to extract the city and region from the data manager and pass it correctly to the santa-santa component.
• Localization Support: Added new message keys tracker_santa_is_at and tracker_santa_is_heading_to with {{location}} placeholders to ensure proper grammar and translation across languages.
• Multi-locale Support: Added and ordered translations for en, en-GB, zh-CN, zh-TW, zh-HK, ja, and ko.

Impacted UI components

• Santa Tracker Map (modvil-tracker)
• Santa Agent (santa-santa)

[KenTandrian]

Santa is stopping at a location:

Santa is heading to a location:

[Jezzamonn]

Looks good! We'll need to get the translations updated internally after this PR is merged.