added language-chooser and href-lang tags
updated upgrade md
updated dependencies
updated dependencies
added twig helper to generate meta tags
Merge pull request #374 from sulu-cmf/feature/language-chooser

Added language-chooser and href-lang tags
updated translation files for admin
Merge branch 'develop' of github.com:sulu-cmf/sulu-standard into develop
updated translation files for admin
Updated for https://github.com/sulu-cmf/sulu/pull/524
Merge pull request #376 from sulu-cmf/feature/remove-content-template-path

Updated for https://github.com/sulu-cmf/sulu/pull/524
updated dependencies
updated dependencies
Merge branch 'develop'

Conflicts:
	UPGRADE.md
	composer.lock