wam: Add UI strings for core, other, and unknown add-on types

[ci skip]

data/tools/addon_manager/html.py

@@ -167,6 +167,21 @@ ADDON_TYPES_INFO = {
         "long": "Miscellaneous content/media",
         "help": "Unit packs, terrain packs, music packs, etc. Usually a (perhaps optional) dependency of another add-on.",
     },
+    "core": {
+        "short": "Core",
+        "long": "Core/Total Conversion",
+        "help": "Cores enable total conversion of The Battle for Wesnoth. A core can replace all the content in Wesnoth: when a different core is loaded, the regular units, terrains and the like do not exist. This can be used to provide a completely different game experience.",
+    },
+    "other": {
+        "short": "Other",
+        "long": "Other",
+        "help": "Add-ons which do not fit any other category.",
+    },
+    "unknown": {
+        "short": "Unknown",
+        "long": "Unknown Add-on Type",
+        "help": "Add-ons with an invalid add-on type field.",
+    },
 }