Replace volume ints with strings

data/json/items/armor.json

@@ -2352,7 +2352,7 @@
     "material_thickness": 1,
     "encumbrance": 2,
     "max_encumbrance": 18,
-    "storage": 96,
+    "storage": "24 L",
     "warmth": 5,
     "flags": [ "BELTED", "OVERSIZE", "STURDY" ]
   },
@@ -7854,7 +7854,7 @@
     "covers": [ "TORSO", "ARMS" ],
     "coverage": 95,
     "encumbrance": 22,
-    "storage": 8,
+    "storage": "2 L",
     "warmth": 80,
     "material_thickness": 5,
     "valid_mods": [ "steel_padded" ],

data/json/items/generic/bathroom_house.json

@@ -159,7 +159,7 @@
     "price": 89,
     "price_postapoc": 180,
     "weight": 227,
-    "volume": 1,
+    "volume": "250 ml",
     "material": "paper",
     "to_hit": -2,
     "snippet_category": [
@@ -189,7 +189,7 @@
     "price": 2100,
     "price_postapoc": 0,
     "weight": 680,
-    "volume": 2,
+    "volume": "500 ml",
     "material": [ "plastic", "steel" ],
     "bashing": 3,
     "to_hit": -1
@@ -204,7 +204,7 @@
     "price": 2500,
     "price_postapoc": 0,
     "weight": 590,
-    "volume": 1,
+    "volume": "250 ml",
     "material": [ "ceramic", "steel" ],
     "bashing": 3,
     "to_hit": 1
@@ -219,7 +219,7 @@
     "price": 1700,
     "price_postapoc": 0,
     "weight": 160,
-    "volume": 2,
+    "volume": "500 ml",
     "material": [ "steel", "plastic" ],
     "bashing": 3,
     "to_hit": 1

data/json/items/generic/dining_kitchen.json

@@ -808,7 +808,7 @@
     "category": "other",
     "description": "A stainless steel mesh colander, for washing rice, vegetables or straining liquid off from noodles or other foods.",
     "type": "GENERIC",
-    "volume": 2,
+    "volume": "500 ml",
     "weight": 318,
     "symbol": ")",
     "price": 600,
@@ -819,7 +819,7 @@
     "name": "splatter guard",
     "description": "A stainless steel mesh screen for preventing flying oil from getting all over your nice counters (or you) when frying.",
     "type": "GENERIC",
-    "volume": 2,
+    "volume": "500 ml",
     "weight": 357,
     "symbol": ")",
     "price": 600,

data/json/items/tools.json

@@ -884,7 +884,7 @@
     "name": "sieve",
     "description": "This is no mere strainer for noodles; it's a sieve used to separate particles of certain sizes.  You could use this to do a really good job sifting flour, remove dust and soil from grain, or perhaps conduct gradiation tests for any civil engineers you might know.  This one has been constructed from steel mesh.",
     "weight": 318,
-    "volume": 2,
+    "volume": "500 ml",
     "price": 700,
     "bashing": 2,
     "material": [ "steel" ],