UI-3360: Bad UI when clicking sub-category of one category

Conflicts:
	platform-ui-web-eXoResources/src/main/webapp/skin/less/Tree/Style.less
PLF-6032 - Activate Romanian translations
Add Persian translations
EXOGTN-1815 Add supported-locale for I18NMessage.js and UIGadget.js

Fix description:
* I18NMessage.js generates the i18n labels for GateIn's Date Time Picker and Save, Cancel buttons when editing a gadget's setting
* UIGadget.js generates the i18n label for the confirmation when deleting a gadget.
PLF-6032: Add supported-locale of Romanian, Polish for I18NMessage.js and UIGadget.js
SWF-2923 : Create pkg-improv branch and update projects versions

Signed-off-by: Arnaud Héritier <aheritier@exoplatform.com>