use ! rather than # for merge request references

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/15278

See merge request !3740

Because we were incorrectly supplying the tooltip title as
`data-original-title` (which Bootstrap's Tooltip JS automatically
applies based on the `title` attribute; we should never be setting it
directly), the value was being passed through as-is.

Instead, we should be supplying the normal `title` attribute and letting
Rails escape the value, which also negates the need for us to call
`sanitize` on it.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/15126

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Closes #15043

Updated UI for new merge request

Closes #2540 

![Screen_Shot_2016-03-29_at_12.53.18](/uploads/426e603675171f0dc4e0af83c7762eba/Screen_Shot_2016-03-29_at_12.53.18.png)

![Screen_Shot_2016-03-29_at_12.53.13](/uploads/645ad7955acfb9f7693245fcc048ee49/Screen_Shot_2016-03-29_at_12.53.13.png)

See merge request !3228

Removed important from css

Redesign labels page

closes #14227 

## Desktop
![Screen_Shot_2016-04-05_at_7.19.37_PM](/uploads/a52b764565b6e2739fb6932178f8bde5/Screen_Shot_2016-04-05_at_7.19.37_PM.png)

## Mobile
![Screen_Shot_2016-04-04_at_6.40.57_PM](/uploads/9804b074126fcdb6755918e9f4c472a7/Screen_Shot_2016-04-04_at_6.40.57_PM.png)

See merge request !3507

This reverts merge request !3494