Translation.h: reorder items in SettingsItemIndex properly and add the comment

source/Core/Inc/Translation.h

@@ -54,6 +54,11 @@ extern const char *DebugMenu[];
 extern const char *AccelTypeNames[];
 extern const char *PowerSourceNames[];
 
+/* !
+ * The order of the items inside this enum class SettingsItemIndex
+ * must be the same as the order of the related items
+ * in the "menuOptions" section of translations_definitions.json file.
+ */
 enum class SettingsItemIndex : uint8_t {
   DCInCutoff,
   MinVolCell,
@@ -90,6 +95,7 @@ enum class SettingsItemIndex : uint8_t {
   CooldownBlink,
   ScrollingSpeed,
   ReverseButtonTempChange,
+  ReverseButtonMenu,
   AnimSpeed,
   AnimLoop,
   Brightness,
@@ -107,7 +113,6 @@ enum class SettingsItemIndex : uint8_t {
   SettingsReset,
   LanguageSwitch,
   SolderingTipType,
-  ReverseButtonMenu,
   NUM_ITEMS,
 };