Use eager loaded #principal association instead of #user (#11904).
Avoid to run one SQL query per member on Project#assignable_users (#11904).
ParseDate missing in Ruby 1.9x (#11290).
Potential can't dup NilClass error in UserPreference (#11905).
Anonymous users should always see public issues only (#11872).
New relation form Cancel link is broken with Chrome 21 (#11036).
Merged r10434 from trunk (#11897)
Traditional Chinese translation updated by ChunChang Lo.
Traditional Chinese translation updated by ChunChang Lo (#11897)
Anonymous users should not see private issues with anonymous author (#11872).
Slight changes to diff/file/annotate styles.
