Web app: missing text fixed, and much faster

If you used the web app recently, Settings and a few other screens could show blank labels where text belonged, and loading felt slow. Both are fixed. The text renders correctly again, and every font the app can ever need is now served from our own domain — as always, the app makes no calls to Google or any third party when it starts. The heaviest parts of the app are also now cached close to you, so first loads and cold reloads are much faster, and updates we ship now reach your browser immediately instead of up to four hours later.