Added locales for export config yaml error messages.
Further checks for badly formed YAML.
Moved yaml error message into locales.
Changed german locale.
Merge branch 'dev' into bug-4158-rows-yaml-error-german-locale

Conflicts:
	app/models/export_card_configuration.rb
	config/locales/de.yml
	config/locales/en.yml
Merge pull request #9 from finnlabs/bug-4158-rows-yaml-error-german-locale

Added locales for export config yaml error messages.