Update src/localization/locales/en-US.json

Co-authored-by: Paul Schreiber <[email protected]>

src/localization/locales/en-US.json

@@ -1021,7 +1021,7 @@
         "form_location_add_data_layer_dialog_title": "<0>Add a data layer to </0><1>{{title}}</1>",
         "form_location_add_data_layer_dialog_title_blank": "Add a data layer to chapter",
         "form_location_add_data_layer_dialog_subtitle": "Select a map from your landscape or group",
-        "form_location_add_data_layer_dialog_description": "Polygon(s), lines, points from the map will be added to this chapter. The embedded data map will become public when publishing this story map.",
+        "form_location_add_data_layer_dialog_description": "Polygons, lines, and points from the map will be added to this chapter. The embedded map will become public when publishing this story map.",
         "form_location_add_data_layer_dialog_layers_count_zero": "You haven't made a map in Terraso yet. Make a map in a group or landscape to see it here.",
         "form_location_add_data_layer_dialog_layers_count_one": "{{count}} data map is available for you",
         "form_location_add_data_layer_dialog_layers_count_other": "{{count}} data maps are available for you",