Fix style in Chrome extension

The extension previously loaded CSS from chrome://resources so that it
would have a style consistent with the rest of Chrome. However,
extensions are no longer permitted to load resources from chrome://.

Local copies of chrome_shared.css and widgets.css have been added from
https://src.chromium.org/chrome/trunk/src/ui/webui/resources/css

This solution seems less than ideal, but it's the same approach Google
used for some of their example extensions.
Fix footer translation in Chrome popup

"What is this?" was not being populated in the footer. A more precise
selector is used to get only elements with the "i18n" attribute.

Quotes were changed in a few places for style consistency.
Quote style consistency
Add favicons to rules in Chrome's popup

Favicons come from Chrome's local cache. If a favicon is not cached,
a generic icon is displayed. No network requests are made.

The first rule without backreferences is used for the favicon URL.
Merge branch 'jayschwa/chrome-favicons'
Removed ruleset Old_Reader. It was a duplicate of TheOldReader, which looks more thorough.
Merge branch '4.0'