feat: add flag icons to label language dropdown

[DSCaskey]

This adds the following flag icons:

And adds the flag icons to the Label language dropdown box'

Closes issue #970

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[what-the-diff]

🌟 PR Summary 🌟

• 🏁 Added Flags for 3 New Countries 🏁
  Welcome Serbia, Bosnia and Herzegovina, and Croatia to the family! Added their beautiful flags to enhance our representation. 🇷🇸 🇧🇦 🇭🇷
• 🌐 Improved Language Display in Preferences 🌐
  Upgraded the way we show languages in the preferences dialog, now with flag icons next to their names, adding a touch of flair and making it visually appealing! 🎉😍

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