fix: improve error handling, language fallback, and update image route | 23/02/2025

[Programador-jr]

Description:
This PR introduces multiple improvements to error handling, language detection, and the image request route.

• [Language Detection for Images Route]: The error message when an image is not found (404 changed to 400) now adapts to the user's system language (en or pt, defaulting to en).
• [Language Detection for API Status Route]: The root (/) endpoint now returns the API status message in the user's language (en or pt, defaulting to en).
• [Updated Image Request Route]: The route for fetching exercise images has been changed from /exercises/{exerciseName}/{imageIndex}.jpg to /api/exercises/{exerciseName}/{imageIndex}.jpg for better consistency with other endpoints.

Validation and Fixes:

• Implemented Accept-Language header detection.
• Adjusted error response logic for missing images.
• Updated frontend references to use the new image request route.

Checklist:

• Image route returns localized error messages.
• Root API route returns localized status messages.
• Default fallback to English if language is unsupported.
• Updated image route to /api/exercises/....
• Verified backwards compatibility for existing API clients.

Impact:
These updates improve API consistency, provide localized responses based on the user's system language, and ensure a standardized structure for accessing exercise images.

[vercel]

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Name	Status	Preview	Updated (UTC)
exercise-api	✅ Ready (Inspect)	Visit Preview	Feb 23, 2025 11:10pm