check: Make the strings translatable
Revert "pipeline: Keep track whether the pipeline has a duration"

This reverts commit 6c3bde8d48dd637407481585b8198d9dea219005.
dogtail: Update test_project
effects: Fixed the _connectAllWidgetCallbacks method to use the parameter

Also cleaned up a bit the code and the docstrings.
dogtail: Fix test_effects