feat: add locale entries for GravityShift and Hardcore modes

- Update gravity-shift: change material to POTION, update description to reflect random potion effects
- Update hardcore: update description to clarify reward loss on fall
- Apply changes to both English and Russian locales

src/main/resources/locales/en.yml

@@ -36,14 +36,14 @@ play:
       lore: "&#404040Race against time! Blocks||&#404040disappear after you step on them."
 
     gravity-shift:
-      material: "feather"
+      material: "potion"
       name: "&#00D4FF&lGravity Shift"
-      lore: "&#404040Gravity changes direction||&#404040as you parkour!"
+      lore: "&#404040Random potion effects||&#404040every few jumps"
 
     hardcore:
       material: "skeleton_skull"
       name: "&#00D4FF&lHardcore"
-      lore: "&#404040One mistake and you're out!||&#404040No second chances."
+      lore: "&#404040Lose all rewards on fall||&#404040No second chances."
 
   spectator:
     name: "&#FFFFFFSpectator"

src/main/resources/locales/ru.yml

@@ -35,14 +35,14 @@ play:
       lore: "&#404040Гонка со временем! Блоки||&#404040исчезают после того, как вы на них встанете."
 
     gravity-shift:
-      material: "feather"
-      name: "&#00D4FF&lСмена гравитации"
-      lore: "&#404040Гравитация меняет направление||&#404040во время паркура!"
+      material: "potion"
+      name: "&#00D4FF&lГравитационный сдвиг"
+      lore: "&#404040Случайные эффекты зелий||&#404040каждые несколько прыжков"
 
     hardcore:
       material: "skeleton_skull"
       name: "&#00D4FF&lХардкор"
-      lore: "&#404040Одна ошибка и всё кончено!||&#404040Второго шанса не будет."
+      lore: "&#404040Потеря всех наград при падении||&#404040Второго шанса не будет."
 
   spectator:
     name: "&#FFFFFFНаблюдатель"