Make it easier to read issue titles in a milestone
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### Problem
This is the current view when viewing a milestone. Labels take most of the visual real estate. The eyes are drawn to the labels, not the issue titles as they should - especially when labels have vibrant colors. On small screens like laptops, it's almost impossible to efficiently browse this list.

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### Proposed solution
Below is the same list, modified through Chrome Dev tools. I just added `opacity` to labels and `font-weight`to titles.

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When hovering an issue, we can put back the opacity to the labels, as shown below.

Those changes are subtle, but will add up to the overall UX.
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