Remove clear-and-rebuild folder action.

We have already removed the view but we seem to have forgotten to remove the
configured action.
Update bootstrap.py.
Merge pull request #651 from 4teamwork/deif-remove-clearandrebuild

Remove clear-and-rebuild folder action.
Task byline: Use adminUnit abbreviation instead of label for sequence_number display.

For example: `AFI 234` instaed of `Amt fuer Informatik 234`