Add translations of Vietnamese

These below are not translated:

TranslationQalingoBackofficeMessages:
	legacy.warning
	header.logo.title
	wiki
	table.host
	form.search.label.text
	header.title.solr
	solr
	main.content.title.solr
	header.title.cache
	cache
	main.content.title.cache
	cache.content.text
TranslationQalingoCommonMessages:
	name_text
	name_html
	copyright
	warning
TranslationQalingoEmailMessages:
	intro
TranslationQalingoFrontofficeMessages:
	main
	seo.url.clp,clp
	header.menu
	shoppingcart.payment.card.crypto
	screenname.label
	address.list.label.address.additional.information
	form.address.label.address.additional.information
	header.title.clp
	clp
	clp.content
	header.title
	main.content.title
	followus