fixed default chart (single quotes were ignored)

src/main/resources/languages/_de.properties

@@ -384,4 +384,4 @@ var plotlyConfig = '{'\n \
 '}';\n \
 \n \
 // Don't touch this line\n \
-Plotly.newPlot('chart-canvas', plotlyData, plotlyLayout, plotlyConfig);
+Plotly.newPlot(''chart-canvas'', plotlyData, plotlyLayout, plotlyConfig);

src/main/resources/languages/_en.properties

@@ -382,5 +382,5 @@ var plotlyConfig = '{'\n \
 \tresponsive: true\n \
 '}';\n \
 \n \
-// Don't touch this line\n \
-Plotly.newPlot('chart-canvas', plotlyData, plotlyLayout, plotlyConfig);
+// Don''t touch this line\n \
+Plotly.newPlot(''chart-canvas'', plotlyData, plotlyLayout, plotlyConfig);