VLCNetworkServerBrowserViewController: Favorite feature improvements
This merge request brings an improvement to the favorites feature with:
- The NetworkServerBrowserViewController's table view that now has a long press contextual menu allowing to mark and unmark folders as favorites on iOS 13.0 and above
This avoids displaying the heart shaped buttons on every row as we now only display it for folders marked as favorites.
The previous behavior is applied for iOS versions below than 13.0.
This merge request also brings a French translation for the localized strings introduced with these improvements.