Makefile: fix po file updating by using same file name everywhere
The update is done on a temporary file since
ce5d711475a3. The name of this
file was first XX.po~ and has been changed to XX.po.tmp in all except of one
place. Do this now.
To run the tests, do:
cd tests/
python run-tests.py
See http://mercurial.selenic.com/wiki/WritingTests for
more information on writing tests.