Widgets / Keyword selection / Support 2 concepts with same label (#293).

Conflicts:

	web-client/src/main/resources/apps/js/GeoNetwork/lib/GeoNetwork/widgets/editor/ConceptSelectionPanel.js
Merge remote-tracking branch 'origin/georchestra-13.06' into georchestra-13.09
Merge remote-tracking branch 'origin/georchestra-13.09' into georchestra-13.12