set default locale to en-US and build this into the library

gives an example of what these locales should look like as modules

Author: alexcjohnson

lib/index-basic.js

@@ -15,4 +15,7 @@ Plotly.register([
     require('./pie')
 ]);
 
+// locales
+Plotly.register(require('./locales.js'));
+
 module.exports = Plotly;

lib/index-cartesian.js

@@ -23,4 +23,7 @@ Plotly.register([
     require('./violin')
 ]);
 
+// locales
+Plotly.register(require('./locales.js'));
+
 module.exports = Plotly;

lib/index-finance.js

@@ -18,4 +18,7 @@ Plotly.register([
     require('./candlestick')
 ]);
 
+// locales
+Plotly.register(require('./locales.js'));
+
 module.exports = Plotly;

lib/index-geo.js

@@ -15,4 +15,7 @@ Plotly.register([
     require('./choropleth')
 ]);
 
+// locales
+Plotly.register(require('./locales.js'));
+
 module.exports = Plotly;

lib/index-gl2d.js

@@ -18,4 +18,7 @@ Plotly.register([
     require('./parcoords')
 ]);
 
+// locales
+Plotly.register(require('./locales.js'));
+
 module.exports = Plotly;

lib/index-gl3d.js

@@ -16,4 +16,7 @@ Plotly.register([
     require('./mesh3d')
 ]);
 
+// locales
+Plotly.register(require('./locales.js'));
+
 module.exports = Plotly;

lib/index-mapbox.js

@@ -14,4 +14,7 @@ Plotly.register([
     require('./scattermapbox')
 ]);
 
+// locales
+Plotly.register(require('./locales.js'));
+
 module.exports = Plotly;

lib/index.js

@@ -71,4 +71,7 @@ Plotly.register([
     require('./calendars')
 ]);
 
+// locales
+Plotly.register(require('./locales.js'));
+
 module.exports = Plotly;

lib/locale-en-us.js

@@ -0,0 +1,17 @@
+/**
+* Copyright 2012-2017, Plotly, Inc.
+* All rights reserved.
+*
+* This source code is licensed under the MIT license found in the
+* LICENSE file in the root directory of this source tree.
+*/
+
+'use strict';
+
+module.exports = {
+    moduleType: 'locale',
+    name: 'en-US',
+    dictionary: {
+        'Click to enter Colorscale title': 'Click to enter Colorscale title'
+    }
+};

lib/locale-en.js

@@ -0,0 +1,17 @@
+/**
+* Copyright 2012-2017, Plotly, Inc.
+* All rights reserved.
+*
+* This source code is licensed under the MIT license found in the
+* LICENSE file in the root directory of this source tree.
+*/
+
+'use strict';
+
+module.exports = {
+    moduleType: 'locale',
+    name: 'en',
+    dictionary: {
+        'Click to enter Colorscale title': 'Click to enter Colourscale title'
+    }
+};

lib/locales.js

@@ -0,0 +1,14 @@
+/**
+* Copyright 2012-2017, Plotly, Inc.
+* All rights reserved.
+*
+* This source code is licensed under the MIT license found in the
+* LICENSE file in the root directory of this source tree.
+*/
+
+'use strict';
+
+module.exports = [
+    require('./locale-en.js'),
+    require('./locale-en-us.js')
+];

src/plot_api/plot_config.js

@@ -130,7 +130,7 @@ module.exports = {
 
     // Which localization should we use?
     // Should be a string like 'en' or 'en-US'.
-    locale: 'en',
+    locale: 'en-US',
 
     // Localization dictionaries
     // Dictionaries can be provided either here (specific to one chart) or globally