Various fixes and add rune support

lang/en.json

@@ -373,7 +373,13 @@
       "Mercenary": "Mercenary",
       "CurrentXP": "XP",
       "CarriesLight": "Carries Light",
-      "Slots": "Slots"
+      "Slots": "Slots",
+      "Runes": "Runes",
+      "DropRuneHint": "Drop a runic spell here to attach it…",
+      "RemoveRune": "Remove rune",
+      "OpenRune": "Open spell sheet",
+      "DifficultyValue": "Difficulty Value",
+      "Exalted": "Exalted"
     },
     "ColorDice": {
       "White": "White (4+)",
@@ -540,6 +546,15 @@
         "MagicSpells": "spells"
       }
     },
+    "Rune": {
+      "Attached": "Rune \"{name}\" attached.",
+      "NotRunic": "Only runic tradition spells can be attached as runes.",
+      "WrongType": "This item only accepts {expected} runes.",
+      "MaxRunes": "This item already has 2 runes (maximum).",
+      "Duplicate": "This rune is already attached to this item.",
+      "MaxExalted": "This item already bears an exalted rune (maximum 1).",
+      "SourceNotFound": "Source spell not found — it may have been deleted."
+    },
     "FreeRoll": {
       "Label": "Free Roll",
       "PoolTitle": "Number of dice (1–20)",