Update localization.md

Use the correct property, it should be "localizations" and not "translations", the latter doesn't work.

Author: PerplexDaniel

14/umbraco-cms/customizing/extending-overview/extension-types/localization.md

@@ -61,7 +61,7 @@ If you do not have many translations, you can also choose to include them direct
       "name": "English",
       "meta": {
         "culture": "en",
-        "translations": {
+        "localizations": {
             "section": {
                 "key1": "value1",
                 "key2": "value2"