Add text wrap for very long usernames

[Y0ngg4n]

Describe the bug
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To Reproduce
Steps to reproduce the behavior:

1. Create a user with a very long username
2. Open the Main Page

Currently the very long username creates a bad behavior of the left pane overlapping.
This could be fixed by a simple text wrap for long usernames

Expected behavior
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I can read everything and can access everything

Screenshots
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Installation (please complete the following information):

• OS: [e.g. Ubuntu]
• PHP version [e.g. PHP 7.2.12]
• NNTmux version or commit [e.g. 1.0]

Additional context
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