On OS X, the confirm dialog appearing would cause the extension to lose focus
and close. This fixes that.

https://github.com/Stitchpunk/atari-ai/blob/master/tabs_to_space.php

Remove redundant text-align
Explicitly set font-size

This reverts commit 224c9f58d3.

Also:
- Reflects the chosen font appearance's text wrapping properties in the
  window
- Makes radio button labels smaller

Users will see paste.as returned, instead of write.as.

Removes dependency on Google Fonts service.

T59

T133