Fix Flatpak locale issue

Fixes:

• Tuner should now be correctly translated in the Flatpak version, many thanks to @ryonakano

Release for eOS 6

• Updated screenshots
• Dark/light mode now adapts to system settings

Release for eOS 6

• Updated screenshots
• Dark/light mode now adapts to system settings

Getting Ready for eOS6

Contains Flatpak manifest for elementaryOS 6 AppCenter and small small minor updates in documentation and comments.
Thanks to @krisives and @danrabbit for their awesome work.

Auto-play, volume contro, codec & bitrate

• Show codec and bitrate on station
• New volume control in header bar
• Dark mode is now saved in settings
• New setting: Auto-play last station
• Properly set Window name

Add Turkish translation

With this release we added Turkish translations and improved on some French translations.

Thanks to @safak45x and @NathanBnm for their work!

Show current track, local Top 100, Website link, Dutch translation

New features:

• Show the current track playing if supported by station
• Show Top 100 stations of user country if detectable
• "Visit Website" link in station context menu

Other improvements:

• Added Dutch translation

Fix broken icons, Station Website link, dark mode switch

• "Visit Website" link in station context menu
• Add manual dark mode switch in settings
• Compact sidebar and content window
• Fix missing icons for non elementary OS systems

Dark mode, Do-Not-Track, general improvements

• Right-click a station to add or remove to favourites directly
• Add settings menu with "Do-Not-Track" option, disables sending station listening events to radio-browser.org
• Add About dialog
• If a station is already in your favourites, you'll see a little star in the title
• Randomly selects one of the available radio-browser.org servers (was always de1 before)
• Favourites are now stored in a local favourites.json file to improve app startup time
• Fix broken dark theme support (elementary and Adwaita dark look fine now)

Error handling, FR and DE translations, improvements

Display an alert if connection to radio-browser.info fails
Display an alert if no search results were found
Refactor StationSource
Include build improvements, use svg app icon #8
Add French translations
Add German translations
Station images are now sized consistently, prevents resizing of header bar