make "Open Sans" (with two capital letters) standard

Author: etpinard

src/plots/layout_attributes.js

@@ -18,7 +18,7 @@ var extendFlat = Plotly.Lib.extendFlat;
 module.exports = {
     font: {
         family: extendFlat({}, fontAttrs.family, {
-            dflt: '"Open sans", verdana, arial, sans-serif'
+            dflt: '"Open Sans", verdana, arial, sans-serif'
         }),
         size: extendFlat({}, fontAttrs.size, {
             dflt: 12

src/plots/plots.js

@@ -288,8 +288,8 @@ plots.addLinks = function(gd) {
     linkContainer.enter().append('text')
         .classed('js-plot-link-container', true)
         .style({
-            'font-family':'"Open Sans",Arial,sans-serif',
-            'font-size':'12px',
+            'font-family':'"Open Sans", Arial, sans-serif',
+            'font-size': '12px',
             'fill': Plotly.Color.defaultLine,
             'pointer-events': 'all'
         })