Merge pull request #246 from lars-erik/6.2.0-fix-U4-3508

Fixes Template.ToXml() (U4-3508) and refactored Template.Import to use P...
Fixed a bug with adding new translation to existing DictionaryItems using DictionaryRepository.

Tested in DictionaryRepositoryTests.

Added support for importing DictionaryItems with PackagingService.
Tested in PackageImportTests against new package resource Dictionary-Package.xml.

Refactored Installer to use the PackagingService method.
Not tested.
Fixed a bug with adding new translation to existing DictionaryItems using DictionaryRepository.

Tested in DictionaryRepositoryTests.

Added support for importing DictionaryItems with PackagingService.
Tested in PackageImportTests against new package resource Dictionary-Package.xml.

Refactored Installer to use the PackagingService method.
Not tested.
Whitespace fixes and dictionary-test-package in project file