Merged r11497 from trunk (#13329).
Merged r11488 from trunk.
Merged r11571 from trunk (#12122).
Preserve gantt options when changing filters (#12122).
Merged r11518 from trunk (#8529).
Merged r11519 and r11520 from trunk (#13335).
Merged r11567 from trunk (#13272).
Adds setting_default_projects_tracker_ids string to locales (#13175, #13272).
Merged r11474 from trunk (#10277).
Merged r11471 from trunk (#5329).
