Google Code-in/2017/Task suggestions

Various small-ish thing that may be good for Google Code-in. Please feel free to add stuff to this page. Take a look at the three links below for inspiration about what kind of things are eligible for being GCI tasks.

• "You can contribute without being a coder!"
• "Tasks", GCI FAQ entry
• Example tasks from previous GCI's
• MetaBrainz' tasks in GCI 2016

Note: Please mark in parentheses which of the categories the task belongs to (multiple can be assigned): coding (CODE); documentation/training (D/T); quality assurance (QA); user interface (UI); or outreach/research (O/R)