Refactor: Improve i18n support and fix multiplication steps layout

- Integrate i18n translations for difficulty descriptions
- Fix intermediate steps alignment in long multiplication display
- Simplify spacing calculations for better layout consistency
- Update translation files for all supported languages (en, es, el, sv)

translations/el.json

@@ -13,7 +13,7 @@
   "points": "Πόντοι:",
   "newProblem": "Νέο Πρόβλημα",
   "congratulations": "🎉 Συγχαρητήρια! 🎉",
-  "youReached20Points": "Έφτασες τους 20 πόντους!",
+  "youReached10Points": "Έφτασες τους 10 πόντους!",
   "playAgain": "Παίξε Ξανά",
   "correct": "Σωστό! Εξαιρετική δουλειά! 🎉",
   "incorrect": "Λάθος. Προσπάθησε ξανά! 💪"

translations/en.json

@@ -13,7 +13,7 @@
   "points": "Points:",
   "newProblem": "New Problem",
   "congratulations": "🎉 Congratulations! 🎉",
-  "youReached20Points": "You've reached 20 points!",
+  "youReached10Points": "You've reached 10 points!",
   "playAgain": "Play Again",
   "correct": "Correct! Great job! 🎉",
   "incorrect": "Incorrect. Try again! 💪"

translations/es.json

@@ -13,7 +13,7 @@
   "points": "Puntos:",
   "newProblem": "Nuevo Problema",
   "congratulations": "🎉 ¡Felicitaciones! 🎉",
-  "youReached20Points": "¡Has alcanzado 20 puntos!",
+  "youReached10Points": "¡Has alcanzado 10 puntos!",
   "playAgain": "Jugar de Nuevo",
   "correct": "¡Correcto! ¡Excelente trabajo! 🎉",
   "incorrect": "Incorrecto. ¡Intenta de nuevo! 💪"

translations/sv.json

@@ -13,7 +13,7 @@
   "points": "Poäng:",
   "newProblem": "Nytt Problem",
   "congratulations": "🎉 Grattis! 🎉",
-  "youReached20Points": "Du har nått 20 poäng!",
+  "youReached10Points": "Du har nått 10 poäng!",
   "playAgain": "Spela Igen",
   "correct": "Rätt! Bra jobbat! 🎉",
   "incorrect": "Fel. Försök igen! 💪"