Bug 474434: Cleanup externalized strings, remove invalid entries

Did some cleaning of externalized strings.
Remove some unused entries, invalid entries and stuff like filenames,
EMF feature names.

Bug: https://bugs.eclipse.org/bugs/show_bug.cgi?id=474434
Change-Id: I4e8a100175645fdb64af34caaf14194689dceacd
Signed-off-by: Flavio Donzé <flavio.donze@gmx.ch>
19 files changed