Output warnings about duplicate localizations

package.json

@@ -4,10 +4,12 @@
   "description": "A directory of free privacy-oriented software.",
   "main": "Makefile",
   "dependencies": {
+    "es7-array.prototype.includes": "^2.0.0",
     "graceful-fs": "~4.1.4",
     "jade": "~1.11.0",
     "livescript": "~1.5.0",
     "lodash.assign": "^4.2.0",
+    "lodash.isequal": "^4.4.0",
     "marked": "~0.3.5",
     "mkdirp": "~0.5.x",
     "moment": "^2.17.1",

source/functions/load-data.ls

@@ -1,6 +1,13 @@
 'use strict'
 
 assign = require 'lodash.assign'
+isequal = require 'lodash.isequal'
+if not Array.prototype.includes then require 'es7-array.prototype.includes'
+
+# TODO: support overrides
+# Then we can expand this list to include e.g. wikipedia_url, but not warn in situations where there isn't a translated Wikipedia article
+# When we do this we should warn about the presence of non-translatable keys (e.g. the `protocols` key should always be consistent)
+translatable = ['notes', 'description']
 
 module.exports = load-data = (path, iso, find-missing = false) ->
   en-data = require path.replace('/' + iso, '/en')
@@ -14,8 +21,26 @@ module.exports = load-data = (path, iso, find-missing = false) ->
         potential-localized-obj = assign {}, obj, localized-obj
         break
 
-    if find-missing and not potential-localized-obj
-      console.log 'Missing ' + iso + ' localization for ' + obj.name
-      continue
+    if find-missing
+      if not potential-localized-obj
+        console.log 'Missing ' + iso + ' localization for ' + obj.name
+        continue
+      else
+        # First we check if entire objects are duplicated
+        # We use localized-obj because potential-localized-obj has already been filled in by lodash.assign
+        if isequal obj, localized-obj
+          console.log iso + ' localization of ' + obj.name + ' duplicates the English version'
+        # Then we check for per-key problems
+        else
+          # For each (non-empty) localizable key in the English version...
+          for key of obj when translatable.includes key and obj[key] is not ''
+              # ...check if it hasn't been localized at all
+              if not localized-obj[key]
+                console.log 'Missing ' + iso + ' localization for key `' + key + '` in project ' + obj.name
+              # ...check if the localized version is a duplicate
+              else if isequal obj[key], localized-obj[key]
+                console.log iso + ' localization of key `' + key + '` in project ' + obj.name + ' duplicates the English version'
+
+        continue
 
     potential-localized-obj or obj