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).
Merged r11473 from trunk (#3676).
Merged r11521 from trunk (#3371).
Merged r11472 from trunk (#3107).
Merged r11560 from trunk to 2.3-stable (#13399)
Korean translation changed by Lucas Yang.
