feat(weather): Add localization support to Weather plugin

[saulob]

🌍 Localization Support for Weather Plugin

This PR adds multi-language support to the Weather plugin, improving usability for non-English users.

This improves the Weather plugin UX significantly for non-English users. I focused on keeping labels short to fit small e-paper displays while maintaining clarity.

✅ Features

• Localized current date (day and month names)
• Localized forecast day labels
• Translated UI labels:
  • Feels like
  • Sunrise / Sunset
  • Wind, Humidity, Pressure
  • UV Index, Visibility
  • Air quality
  • Last refresh
• Translated Air Quality Index (AQI) scales
• Support for multiple languages:
  • English (default)
  • Portuguese
  • Spanish
  • French
  • German
  • Italian
  • Dutch
  • Indonesian

⚙️ Implementation

• Introduced a centralized LOCALE_DATA structure
• Added helper functions:
  • get_localized_date
  • get_localized_day_short
  • get_ui_label
• Updated backend parsing to inject localized labels
• Updated frontend template to use dynamic labels instead of hardcoded text

🎯 Notes

• Focused on keeping labels short to fit small displays
• Fallback to English when language is not supported
• No breaking changes to existing configurations

📸 Screenshots

Weather plugin UI is now fully localized across supported languages

[Copilot]

Pull request overview

Adds localization to the Weather plugin by introducing a centralized locale/translation mapping and wiring language selection through backend parsing and the frontend template.

Changes:

• Added LOCALE_DATA plus helper functions to localize current date, forecast day labels, and UI strings in weather.py.
• Added a language selector to the plugin settings UI and persisted it in plugin settings.
• Updated the weather render template to use dynamic (localized) labels and a stable dp.key for wind-arrow rendering.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
src/plugins/weather/weather.py	Introduces locale dictionary + helpers; passes language through parsing; localizes labels/date/day names.
src/plugins/weather/settings.html	Adds language dropdown and loads default/saved language.
src/plugins/weather/render/weather.html	Replaces hardcoded strings with backend-provided localized labels; uses dp.key for wind arrow conditional.

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[saulob]

All Copilot review comments addressed