Enable NLS / TranslationBundle to be used in OSGi

Enable NLS / TranslationBundle to be used in OSGi

TranslationBundle#load() used to load resource bundles through
ResourceBundle#getBundle() without explicitly specifying a class loader.
In this case, the class laoder of the calling class (TranslationBundle
here) is used. This approach fails in runtime environments like OSGi
where there are multiple class loaders.

This change enables loading resource bundles in multi class loaders
environments. The fix is to pass the class loader of the
TranslationBundle-derived class to ResourceBundle#getBundle().

Bug: 436232
Change-Id: I39db61e012dc93ebf388a71bf6088a3310a22bac
Signed-off-by: Rüdiger Herrmann <ruediger.herrmann@gmx.de>