[Tails-l10n] [Updated] Release schedule for Tails 3.3

Hi!

Apparently the date in our calendar was/is wrong, so Tails 3.3 should be released on 2017-11-14 (not 2017-11-16). Here's the updated schedule:

* 2017-11-13:
   - All feature branches targeting Tails 3.3 should be merged into
     the `stable` branch by noon, CET. I'm open to make exceptions
     if you can be online and responsive during that afternoon, but
     ask me first!
   - Build and upload Tails 3.3.
   - Start testing Tails 3.3 during late CET if building the image
     went smoothly.

* 2017-11-14:
- Finish testing Tails 3.3 by the afternoon, CET.
- Release Tails 3.3.

Testers, please let me know:

* if you are available on 2017-11-13, late CET

* if you are available on 2017-11-14, morning to afternoon, CET.

Cheers!