update jqPlot (resolves compatibility issues with jQuery 1.9+)
update translation source files from Transifex
Merge branch 'i18n-update' into i18n

Conflicts:
	helpdesk/locale/fr/LC_MESSAGES/django.mo
	helpdesk/locale/it/LC_MESSAGES/django.mo
	helpdesk/locale/pt_BR/LC_MESSAGES/django.mo