Long usernames overflow and bleed into post content

[Clorith]

Long usernames overflow, and depending on the post length may clash with the post content.

[netweb]

Adding word-break: break-word; looks alright from here:

#bbpress-forums p.bbp-user-nicename {
    font-weight: bold;
    color: #888;
    display: inline-block;
    margin: 0;
    word-break: break-word;
}

[SergeyBiryukov]

Replying to netweb:

Adding word-break: break-word; looks alright from here

It does :) a.bbp-author-name already has word-break: break-word, so let's add it for the nicename too.

[netweb]

In 4098:

BuddyPress.org: bb-base: Add word-break: break-word for user nicenames.

This change ensures user nicenames are able to be contained to wrap within the topic/reply author sections of topics and replies on support forums.

Props SergeyBiryukov.
Fixes #2056.