Load a set of predefined labels (#3459)

* Can use a predefined set of labels

* Change UI

* Fix HTML file indentation

* Avoid reading file from other directory (security issue)

* Apply a better fix

* Remove not used variable

* Merge upstream/develop

* Do modifications

* Raname

* remove binding + rename variable

conf/label/Default

@@ -0,0 +1,7 @@
+#ee0701 bug
+#cccccc duplicate
+#84b6eb enhancement
+#128a0c help wanted
+#e6e6e6 invalid
+#cc317c question
+#ffffff wontfix