Issue 5706 - Finish custom filter list dialog

locale/en-US/new-options.json

Index: locale/en-US/new-options.json
===================================================================
--- a/locale/en-US/new-options.json
+++ b/locale/en-US/new-options.json
@@ -385,21 +385,29 @@
     "description": "Dialog title for adding a predefined subscription",
     "message": "Do you really want to use this filter list?"
   },
-  "options_dialog_custom_title": {
-    "description": "Title of custom subscription modal dialog",
+  "options_dialog_import_title": {
+    "description": "Title of 'Add a filter list' dialog",
     "message": "Add a filter list"
   },
   "options_close": {
     "description": "Close modal button",
     "message": "close"
   },
-  "options_dialog_custom_subscription_title": {
-    "description": "Add custom subscription modal import hint message",
-    "message": "Filter list location"
+  "options_dialog_import_subscription_title": {
+    "description": "Input label in 'Add a filter list' dialog",
+    "message": "Filter list name"
   },
-  "options_dialog_custom_import": {
-    "description": "Button in add custom subscription modal dialog",
-    "message": "Add filter list"
+  "options_dialog_import_subscription_title_error": {
+    "description": "Error message of 'Filter list name' input in 'Add a filter list' dialog",
+    "message": "Please fill out the field"
+  },
+  "options_dialog_import_subscription_location": {
+    "description": "Input label in 'Add a filter list' dialog",
+    "message": "Filter list URL"
+  },
+  "options_dialog_import_subscription_location_error": {
+    "description": "Error message of 'Filter list URL' input in 'Add a filter list' dialog",
+    "message": "Enter a valid URL"
   },
   "options_dialog_edit_own_list": {
     "description": "Edit own filter list section name in custom subscription modal dialog",