Fix word-wrap in navigation bar

[manan30]

Link breaks on some browsers (Opera) when styled with word-break. It causes the text to overflow to the next line. This fix removes the style that causes the issue.

Fixes #151

[XhmikosR]

@MartijnCuppens I remember we added this to prevent links going out of view.

[XhmikosR]

1. there shouldn't be commented out code
2. We added this explicitly to prevent long links from overflowing the page, which means this will re-introduce the issue, see Break long links in posts #81

[manan30]

1. there shouldn't be commented out code
2. We added this explicitly to prevent long links from overflowing the page, which means this will re-introduce the issue, see Break long links in posts #81

I did not understand the screenshot on #80. Can you please explain more about that?

[mdo]

Closing for #154.