add minValue and placeholder for seats field

data/presets.yaml

@@ -1588,6 +1588,8 @@ en:
       seats:
         # seats=*
         label: Seats
+        # seats field placeholder
+        placeholder: '2, 4, 6...'
       second_hand:
         # second_hand=*
         label: Sells Used

data/presets/fields.json

@@ -263,7 +263,7 @@
     "seamark/type": {"key": "seamark:type", "type": "combo", "universal": true, "label": "Seamark"},
     "seamark/wreck/category": {"key": "seamark:wreck:category", "type": "combo", "label": "Category"},
     "seasonal": {"key": "seasonal", "type": "check", "label": "Seasonal"},
-    "seats": {"key": "seats", "type": "number", "label": "Seats"},
+    "seats": {"key": "seats", "type": "number", "minValue": 0, "label": "Seats", "placeholder": "2, 4, 6..."},
     "second_hand": {"key": "second_hand", "type": "combo", "label": "Sells Used", "placeholder": "Yes, No, Only", "strings": {"options": {"yes": "Yes", "no": "No", "only": "Only"}}},
     "service_rail": {"key": "service", "type": "combo", "label": "Service Type", "strings": {"options": {"spur": "Spur", "yard": "Yard", "siding": "Siding", "crossover": "Crossover"}}},
     "service_times": {"key": "service_times", "type": "text", "label": "Service Times"},

data/presets/fields/seats.json

@@ -1,5 +1,7 @@
 {
     "key": "seats",
     "type": "number",
-    "label": "Seats"
+    "minValue": 0,
+    "label": "Seats",
+    "placeholder": "2, 4, 6..."
 }

dist/locales/en.json

@@ -2770,7 +2770,8 @@
                     "label": "Seasonal"
                 },
                 "seats": {
-                    "label": "Seats"
+                    "label": "Seats",
+                    "placeholder": "2, 4, 6..."
                 },
                 "second_hand": {
                     "label": "Sells Used",