Extended logging to catch an exception in #202.
Reacting to code review.
Fixed "Display name" field len,

fixed a typo in sanity check email.
Merge remote-tracking branch 'upstream/master' into 275_field_len
Changed course homepage link to a button

(#274)
Merge pull request #277 from egor83/275_field_len

Fixed "Display name" field length
Merge remote-tracking branch 'upstream/master' into 274_course_page_link
Merge pull request #280 from egor83/274_course_page_link

Changed course homepage link to a button (fixes #274)
Merge remote-tracking branch 'upstream/master' into 202_flag_fb_exception
Merge pull request #266 from egor83/202_flag_fb_exception

Catching a feedback flagging exception