M9: whatsnew/ and changelog.po

[tamnd]

whatsnew/ and changelog.po. Spends model calls.

Roughly 27 600 entries and 915 batches. The last tier, and the one with the lowest value per call.

Checklist

• Run whatsnew/ excluding changelog.po
• Decide, with the numbers in front of you, whether changelog.po is worth 575 calls. A recorded decision not to translate it is an acceptable outcome of this milestone, because it is 16.6 % of the corpus in one generated file that nobody reads in translation
• If the answer is yes, run it and audit it
• Full-corpus audit, full coverage report

Exit

Every file is either translated and audited, or explicitly and publicly excluded with the reason written in ROADMAP.md. pydocvi audit runs over all 87 008 entries with every hard check passing.