Add Language Change Functionality

[MDeLuise]

Hey Plant-it community!
I've added the feature of changing the app language directly inside the app. Now, the app will automatically set the language based on the device default language upon startup, but users can also change it within the app settings. This PR fixes #216.

What's new?

• Implemented language selection feature using supported locales and radio buttons.
• Saved user-selected language across app restarts using SharedPreferences.

Why is it important?

Language flexibility is crucial for user experience, especially in diverse communities where users may prefer different languages.

How to Use?

• Open the app, and the language will be set to your device default.
• Navigate to Settings > Change Language to select a different language.
• Your chosen language will persist across app sessions.

Cheers and happy planting! 🌿🌼

[github-actions[bot]]

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