i18n_tool.py list-translators can miss contributions

[rmol]

Description

The list-translators action of i18n_tool.py only looks back until the last recognized sync from develop. If there were contributions between that and the previous release, they will not be credited.

Steps to Reproduce

Compare the output of make list-translators to the Weblate translator credits report.

Expected Behavior

That all contributions could be credited.

Actual Behavior

Right now, Weblate will credit some contributions to Swedish (possibly others) that i18n_tool.py does not.

Comments

Right now the commit range examined for contributions is determined automatically by finding the most recent sync, but we could permit the specification of the interval.

Taking a step back, we could consider whether it's really useful to maintain this code, instead of just using the Weblate report to credit translators in release communications. Gathering credits from the git history means we're not tied to Weblate, but should we ever migrate to another translation platform, it would almost certainly have an equivalent report.

[rmol]

Reported again, by the same person, in #5570. 🙄 And it's been fixed.