Check that content_for is cleared
Prevent duplicate output of error messages

The method content_for prepends content on each call and does not remove the
former content. That is why we need to clear content_for before displaying
another error.
updates reform gem
Test that timezone is set globally
Retrieve time zone from user preferences
Set user preferences for messages
Respect time zone for dates
Extract preference creation
Test date time directives
Add date/time formatting settings
Centralize date time directives in single file
Consider date/time format settings
Date and time directive
Use date/time directives in work package details view
Enforce ISO 8601 for date formatting
Pass user prefs to timelogs view
Correct reference to directive
Add specs
Map timezone to tz data
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