lower static_max_age to 10 minutes until we have cacheproof urls for all static assets
chore(l10n): show missing strings for supported languages
Merge pull request #990 from mozilla/supported-locale-more-info

chore(l10n): show missing strings for supported languages
Merge pull request #991 from jrgm/static_max_age

lower static_max_age to 10 minutes until we have cacheproof urls for all static assets
feature(client): Add a button spinner!

Displayed on:
* View render
* Form submit

* Add a new static function to Base - Base.withProgress. This shows a progress
 indicator if the action takes a long time.

fixes #371
refactor(client): Progress indicator cleanup.

* Rename progress-indicator.js to button_progress_indicator.js
* Move the withProgress function to form.js->showButtonProgressIndicator.