v2.3.0

As always, download the lichess puzzle database from here and unpack it to the "puzzles" directory of the app.

I'm rushing this release a bit because of the last point in the list below, the lichess db changed it's opening field and this required a change in this app as well. If you experience any issue, please let me know.

Thanks to lichess user Instit for contributing the French translation! Translations to other languages are welcomed.

What's new:

• The interface is now translated to Portuguese, Spanish and French
• Added the option to show board coordinates
• Added the option to favorite/unfavorite puzzles and search these favorites
• Added a previous puzzle button
• Fixed compatibility with the current lichess db (they changed how the opening info is stored and so the previous offline-chess-puzzles executable wasn't working properly for this kind of search anymore)