Fix word wrapping in context/course nav
Fix word wrapping in context/course nav

Fixes: CNVS-34885

Test plan:
- Go to any course in Canvas

- In the left-side content/course menu, open
  Inspector and change the text on the links to
  something that will cause a line break. You should
  now see this behavior:
  https://www.screencast.com/t/4282SzdW

- Note that some browsers support the hyphen rule
  and will insert a hyphen into long strings when they
  break:
  https://www.screencast.com/t/AwpnscdsOjv

Change-Id: I3ab61bef644d4a41f3e8d6f521e5b51eabcef85f
Reviewed-on: https://gerrit.instructure.com/102295
Tested-by: Jenkins
Reviewed-by: Stephen Jensen <af2501a686d970a4ae53690c2b6f7e448f31f7df@instructure.com>
QA-Review: Dan Sasaki
Product-Review: Chris Hart <b82b40b84a2f06957ec9caf1768340bd6b929cc4@instructure.com>

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