New update version page

Background / User story

As ABP user I would like to be informed about new updates so I can know what was changed

What to change

• Design: https://eyeogmbh.invisionapp.com/share/FNU32OJKERP
• Research: https://dovetailapp.com/projects/20f2176b-5c9c-4f9e-bee4-05777c63cf2c/insights/present
• Spec: eyeo/specs/spec!300
• Development: Add "ignore": ["/en/ignorable.json"] to crowdin.yml (see #371 (closed)) to ignore updates files when uploading translatable strings to Crowdin.

Hints for testers

• On first-run: First-run page should open.
• On update: Updates notification should be shown instead of automatically opening updates page in foreground.
• On update with a data corruption: Problem notification should be shown (see #589 (closed)) instead of updates notification.
• Day1 landing page should remain visually and functionally unchanged.
• New notification should be dismissable (e.g. not reappear when opening the icon popup again or after downloading notifications.json).
• Clicking on the Adblock Plus logo in the updates page should open the link in a new tab.
• Clicking on a notification link should close the icon popup on Firefox.
• Language names in desktop settings page should be shown correctly.

Hints for translators

• Replaced content of updates.json.
• Added updates-latest.json for any update-specific strings that are not meant to be translated by/uploaded to Crowdin. Currently, this file merely contains placeholder strings for testing. The content will be replaced with the actual strings later on in #702 (closed).

Integration notes

• Requires core#126.
• Allow notifications to open updates.html using "abp:updates".
• Call showUpdatesNotification() from lib/notifications.js instead of opening updates.html directly.
  • Remove existing platform restriction so that it will be shown on all supported platforms.
  • Our plan is to increment the updatesVersion number in adblockplusui/lib/prefs.js for each major update in order to trigger the updates notification each time.
• Renamed lib/day1Init.js to lib/notifications.js.
• Import the following new files:
  • data/locales.json
  • data/updates.json
  • skin/icons/updates/panda.gif
  • skin/icons/email-white.svg
  • skin/icons/facebook-white.svg
  • skin/icons/fixes.svg
  • skin/icons/improvements.svg
  • skin/icons/twitter-white.svg
  • skin/icons/update.svg
• Import translations from locale/*/updates-latest.json.
• Stop importing the following files:
  • data/languages.json
  • skin/icons/updates/*