docs/random/release: The release manager should run 'make download-po' before making a release to make sure translati...

Original commit message from CVS:
* docs/random/release:
The release manager should run 'make download-po' before making a
release to make sure translations are up-to-date.
* po/LINGUAS:
* po/be.po:
* po/pl.po:
* po/rw.po:
Add some new translations.