Enhanced L10N detection

[dharmann]

• Swithced priority between Laravel conf value and browser accepted languages
• normalized L10N to ISO 639-1 format

[what-the-diff]

PR Summary

• Improved Location Settings in getPreferredLocale function
  • The method for determining language preference was refined. Previously, if the program wasn't able to find a match for the preferred language, it would default to the language set within the app's configuration. Now it has a fail-safe, where if this too is not identifiable, it will default to English.
  • The function has been made more flexible. It can now also accept and correctly process more general inputs by just looking at the first part of the locale (e.g., English en from en-US) ensuring more effective communication across different language norms and standards.