[Tails-l10n] Please translate announces for Tails 0.19

Hi,

in testing branch, please translate:

  - wiki/src/security/Numerous_security_holes_in_0.18.*.po
  - wiki/src/news/version_0.19.*.po (with many strings in common with
    the rc1 call for testing)

Thanks in advance!

Cheers,
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