diff --git a/main/src/com/google/refine/ProjectMetadata.java b/main/src/com/google/refine/ProjectMetadata.java
index 8b9c42306..98fba08e0 100644
--- a/main/src/com/google/refine/ProjectMetadata.java
+++ b/main/src/com/google/refine/ProjectMetadata.java
@@ -114,7 +114,7 @@ public class ProjectMetadata {
     private ArrayNode _userMetadata = ParsingUtilities.mapper.createArrayNode();
     
     @JsonProperty("customMetadata")
-    private Map<String, Serializable>   _customMetadata = new HashMap<String, Serializable>();
+    private Map<String, Object>   _customMetadata = new HashMap<>();
     @JsonProperty("preferences")
     @JsonView(JsonViews.SaveMode.class)
     private PreferenceStore             _preferenceStore = new PreferenceStore();
@@ -247,7 +247,7 @@ public class ProjectMetadata {
 
     @JsonIgnore
     public Serializable getCustomMetadata(String key) {
-        return _customMetadata.get(key);
+        return (Serializable)_customMetadata.get(key);
     }
 
     public void setCustomMetadata(String key, Serializable value) {
diff --git a/main/tests/data/example_project_metadata.json b/main/tests/data/example_project_metadata.json
index a9507fe8b..b604ed843 100644
--- a/main/tests/data/example_project_metadata.json
+++ b/main/tests/data/example_project_metadata.json
@@ -1 +1 @@
-{"name":"numeric facet test","tags":[],"created":"2018-09-04T16:07:31Z","modified":"2018-09-04T17:02:31Z","creator":"","contributors":"","subject":"","description":"","rowCount":4,"title":"","homepage":"","image":"","license":"","version":"","customMetadata":{},"importOptionMetadata":[{"guessCellValueTypes":false,"projectTags":[""],"ignoreLines":-1,"processQuotes":true,"fileSource":"(clipboard)","encoding":"","separator":"\\t","storeBlankCellsAsNulls":true,"storeBlankRows":true,"skipDataLines":0,"includeFileSources":false,"headerLines":1,"limit":-1,"quoteCharacter":"\"","projectName":"numeric facet test"}]}
+{"name":"numeric facet test","tags":[],"created":"2018-09-04T16:07:31Z","modified":"2018-09-04T17:02:31Z","creator":"","contributors":"","subject":"","description":"","rowCount":4,"title":"","homepage":"","image":"","license":"","version":"","customMetadata":{"hash":"a9f7bc0818ab566264e5b83d17eb745c"},"importOptionMetadata":[{"guessCellValueTypes":false,"projectTags":[""],"ignoreLines":-1,"processQuotes":true,"fileSource":"(clipboard)","encoding":"","separator":"\\t","storeBlankCellsAsNulls":true,"storeBlankRows":true,"skipDataLines":0,"includeFileSources":false,"headerLines":1,"limit":-1,"quoteCharacter":"\"","projectName":"numeric facet test"}]}
diff --git a/main/tests/data/example_project_metadata_save_mode.json b/main/tests/data/example_project_metadata_save_mode.json
index 84d4e0490..4a33b9e66 100644
--- a/main/tests/data/example_project_metadata_save_mode.json
+++ b/main/tests/data/example_project_metadata_save_mode.json
@@ -1 +1 @@
-{"name":"numeric facet test","tags":[],"created":"2018-09-04T16:07:31Z","modified":"2018-09-04T17:02:31Z","creator":"","contributors":"","subject":"","description":"","rowCount":4,"title":"","homepage":"","image":"","license":"","version":"","customMetadata":{},"importOptionMetadata":[{"guessCellValueTypes":false,"projectTags":[""],"ignoreLines":-1,"processQuotes":true,"fileSource":"(clipboard)","encoding":"","separator":"\\t","storeBlankCellsAsNulls":true,"storeBlankRows":true,"skipDataLines":0,"includeFileSources":false,"headerLines":1,"limit":-1,"quoteCharacter":"\"","projectName":"numeric facet test"}],"password":"","encoding":"UTF-8","encodingConfidence":0,"preferences":{"entries":{"scripting.starred-expressions":{"class":"com.google.refine.preference.TopList","top":2147483647,"list":[]},"scripting.expressions":{"class":"com.google.refine.preference.TopList","top":100,"list":[]}}}}
\ No newline at end of file
+{"name":"numeric facet test","tags":[],"created":"2018-09-04T16:07:31Z","modified":"2018-09-04T17:02:31Z","creator":"","contributors":"","subject":"","description":"","rowCount":4,"title":"","homepage":"","image":"","license":"","version":"","customMetadata":{"hash":"a9f7bc0818ab566264e5b83d17eb745c"},"importOptionMetadata":[{"guessCellValueTypes":false,"projectTags":[""],"ignoreLines":-1,"processQuotes":true,"fileSource":"(clipboard)","encoding":"","separator":"\\t","storeBlankCellsAsNulls":true,"storeBlankRows":true,"skipDataLines":0,"includeFileSources":false,"headerLines":1,"limit":-1,"quoteCharacter":"\"","projectName":"numeric facet test"}],"password":"","encoding":"UTF-8","encodingConfidence":0,"preferences":{"entries":{"scripting.starred-expressions":{"class":"com.google.refine.preference.TopList","top":2147483647,"list":[]},"scripting.expressions":{"class":"com.google.refine.preference.TopList","top":100,"list":[]}}}}
diff --git a/main/webapp/modules/core/langs/translation-en.json b/main/webapp/modules/core/langs/translation-en.json
index 2b88eb0b1..365b4d5d5 100644
--- a/main/webapp/modules/core/langs/translation-en.json
+++ b/main/webapp/modules/core/langs/translation-en.json
@@ -23,6 +23,11 @@
     "core-index/sample-data": "sample data sets",
     "core-index/change-metadata-value": "Change value of metadata key",
     "core-index/name": "Project name:",
+    "core-index/tags": "Tags:",
+    "core-index/title": "Title:",
+    "core-index/license": "License:",
+    "core-index/homepage": "Homepage:",
+    "core-index/image": "Image:",
     "core-index/created": "Create time:",
     "core-index/modified": "Last modified time:",
     "core-index/creator": "Creator:",
@@ -31,9 +36,9 @@
     "core-index/description": "Description:",
     "core-index/rowCount": "Row count:",
     "core-index/metaDatas": "Project metadata",
-    "core-index/customMetadata": "Custom metadata(JSON):",
+    "core-index/customMetadata": "Custom metadata (JSON):",
     "core-index/id": "Project ID:",
-    "core-index/importOptionMetadata": "Import option metadata(JSON):",
+    "core-index/importOptionMetadata": "Import option metadata (JSON):",
     "core-index-create/create-proj": "Create Project",
     "core-index-create/starting": "Starting",
     "core-index-create/done": "Done.",
diff --git a/main/webapp/modules/core/scripts/index/edit-metadata-dialog.js b/main/webapp/modules/core/scripts/index/edit-metadata-dialog.js
index 96d2e1eb1..6fb7ea275 100644
--- a/main/webapp/modules/core/scripts/index/edit-metadata-dialog.js
+++ b/main/webapp/modules/core/scripts/index/edit-metadata-dialog.js
@@ -13,7 +13,7 @@ function EditMetadataDialog(metaData, targetRowElem) {
       
       var td0 = tr.insertCell(0);
       
-      var keyLable = $.i18n._('core-index')[key] || key;
+      var keyLable = $.i18n('core-index/'+key) || key;
       $(td0).text(keyLable);
 
       var td1 = tr.insertCell(1);