Add word-wrap to issue title on issue and milestone boards

## What does this MR do?
Adds word-wrap to the issue title found on the issue board and the milestone boards

## Are there points in the code the reviewer needs to double check?
Shouldn't be

## Why was this MR needed?
Improves UI

## Screenshots (if relevant)
Before:
![Screen_Shot_2016-09-19_at_10.19.18_AM](/uploads/7b79fe87c12c0d9a89fff5c725c546a4/Screen_Shot_2016-09-19_at_10.19.18_AM.png)
![Screen_Shot_2016-09-19_at_10.19.14_AM](/uploads/80a7e37433c98a406806249f01fe72fd/Screen_Shot_2016-09-19_at_10.19.14_AM.png)


After:
![Screen_Shot_2016-09-19_at_10.18.54_AM](/uploads/e3a9420262a5d521478bea5601afafab/Screen_Shot_2016-09-19_at_10.18.54_AM.png)
![Screen_Shot_2016-09-19_at_10.19.04_AM](/uploads/b87d661bd1492777c4f677ea3ed09dcc/Screen_Shot_2016-09-19_at_10.19.04_AM.png)


## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?
Closes #22274

See merge request !6412