I18n Support

Added general i18n concept and locale support for BindingInfoRegistry, ThingTypeRegistry and ConfigDescriptionRegistry.
Added german language file to yahoo weather binding.

Also-by: Michael Grammling <m.grammling@external.telekom.de>
Also-by: Alex Tugarev <telekom@tugarev.de>
Signed-off-by: Dennis Nobel <d.nobel@external.telekom.de>