dialog_ui, wrapping long lines in license / readme boxes

[Timothee Besset]

Here goes

This makes the text wrap in the dialog boxes used in text mode installs to
display licenses and readme files. It is still a fairly clean patch, it's
taken from my branch and I checked that it applied to the current
icculus.org tree without trouble. See if you want to patch it in directly.

TTimo
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