updated bower components

- updated bootstrap-datepicker to 1.9.0
- updated chart.js to 1.1.1
- updated ckeditor to 4.12.1
- updated jquery to 3.4.1
- updated raphael to 2.2.7
- updated select2 to 4.0.8

bower_components/bootstrap-datepicker/docs/options.rst

@@ -449,6 +449,9 @@ Boolean.  Default: true
 
 If false, the datepicker will not append the names of the weekdays to its view. Default behavior is appending the weekdays.
 
+.. figure:: _static/screenshots/option_showweekdays.png
+    :align: center
+
 
 title
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