Change msgid-bugs-address for scenarios to team@uh

Consistent with other files now.
Do not print file location comments for scenario translations

Seeing lines like this in every string does not help much:
  #: po/tutorial.py

Also removes code for replacing the (useless) line numbers.
Fix script generating scenario translation template

0c2205be3455099cc300dfa8a249c5fdb87acd1a