These elements were already using these colors because they inherited
them from their parent elements or Foundation already defined them.
Note that the only contents of `.comment-info` are: `.user-name` and
`.is-author`, `.is-association`, `.level-1`, ... and the link to the
comment. All of these elements were overwriting the `$text-medium`
color, so there's no need to set it. That means we can use the default
text color for `.user-name` without specifically setting it.
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