Fix word wrap for names

[will-moore]

Fixes #572
See report at https://forum.image.sc/t/image-names-not-wrapping/100493

To test, set various long names without spaces.
These should now wrap correctly instead of disappearing off the screen.

[pwalczysko]

Yes, working fine on merge-ci.

the interesting feature is that a dash - character seems to be preferred for inserting the break. I think this is acceptable (the wrapping happens even if no dash is present in name). Just a heads up.