fix typos, including a severe one

bugfix see configurator.py:233

btw, pycharm does detect a lot of these automatically in the IDE (e.g. for typos it "underlines" the mis-spelled words. it also detects a lot of other issues, like pep8, coding mistakes, etc.).

if you don't know pycharm, maybe give it a try. as a opensource project, you maybe can even get a pycharm license for all developers working on the project.
I guess this is the "severe one"... Shall we have a unittest for that? @jdkasten?