Merge branch 'fix_labels_edit' into 'master'

Fix labels preview color when edit

This is related to #515. Parentheses are missing in coffeescript. For this reason, the color preview is not updated when loading the labels edit page.

See merge request !173

app/assets/javascripts/labels.js.coffee

@@ -4,7 +4,7 @@ class Labels
     @setupLabelForm(form)
     @cleanBinding()
     @addBinding()
-    @updateColorPreview
+    @updateColorPreview()
 
   addBinding: ->
     $(document).on 'click', '.suggest-colors a', @setSuggestedColor