Use rails label helper in queries form (fixes #2150)
Fix German label translations for query form (#2150)
Add change log entry (#2150)
Fix timeline grouping labels (#2146)
Update CHANGELOG.md
Reactivate accessibility css

- Added setting to turn accessibility mode on/off for not logged in
  users
render author in planning_element/show
added changelog entry

Conflicts:
	doc/CHANGELOG.md
Merge pull request #791 from opf/fix/no_author_id_in_planning_element_show_3666

render author in planning_element/show
Fix rake cucumber:plugins when being run with RAILS_ENV=test

The rake task previously gave empty arguments to cucumber, which
cucumber doesn't like.

The following is my theory on why this works when the rake task is
started in a non-test environment. In the test environment, cucumber
is set to not fork for startup performance. When forking, parameters
are given to cucumber in another way (as command line parameters) and
possibly processed differently. This results in the empty arguments
being skipped, while when not forking these empty arguments are
treated as feature folders that can't be found obviously.

With this fix the empty arguments are not given to cucumber.
merged PR #796, i.e. fix/link-query-form-labels-2150
Remove not needed selenium call from cuke

[skip ci]
Merge pull request #801 from opf/fix/reactivated_accessibility_css
Merge pull request #803 from opf/fix/rake_cucumber_plugins_in_test_env

Fix rake cucumber:plugins when being run with RAILS_ENV=test
Removes superfluous css file
Merges sass rules
Fixes low contrast for inactive calendar days
Adds changelog entry
Merge pull request #805 from opf/fix/accessibility_low_contrast_calendar_view_2229

[FIX] Accessibility low contrast calendar view 2229
Fix event type retrieval in work packages activity provider (#3723)