Pass rate chart moved and other minor changes and fixes

Course statistics

• Combined the pass rate chart with Students and Attempts, it can be found below the table on each pane
• A dash is displayed instead of "NaN %" if a pass-% cannot be calculated

Evaluation overview - University view:

• Fixed titles and labels to refer to faculty instead of programme
• Evaluation overview, accessible only from url (link from tilannekuvalomake) is now different than University-view (clickable from Oodikone navigation menu). The evaluation overview has links to faculties, and a different info message.

Miscellaneous

• Named 'Year class' to 'Class statistics' and 'Study guidance groups' to 'Guidance groups'
• Removed old tooltip from class statistics search which notified that searching by tags now happens via filters