Polish messageBox.js
Polish messageBox.js

Add white-space: pre-wrap to fix #10119
Remove redundant styles

Auditors: @cezaraugusto

Test Plan:
1. Open https://jsfiddle.net/9o5tmgst/1/
2. Make sure the lines are wrapped
3. Open https://jsfiddle.net/c5o7arqu/
3. Make sure everything is properly alinged

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