For working out which languages have 80% of core translated, TSG is
now relevant and the old tutorial isn't. This means that the 80%
threshold has increased by around 500 strings.
Add missing changelog entries for 1.19.8 directly to the changelog.
The failure mode caused it to overwrite the es_ES stats
with the es_419 ones. Skipping the CI step, as this script
is only run by the pot-update targets.
[ci_skip]
(cherry picked from commit ec7bd83721)
