OK, now I have tha latest git, fail again:

c:\Pywikibot-dev>git clone --recursive --branch stable --depth 3 https://gerrit.wikimedia.org/r/pywikibot/core.git
Cloning into 'core'...
remote: Counting objects: 599, done
remote: Finding sources: 100% (599/599)
remote: Getting sizes: 100% (507/507)
remote: Compressing objects: 100% (4997469/4997469)
Receiving objects: 100% (599/599), 1.65 MiB | 1.44 M

Resolving deltas: 100% (120/120), done.
Submodule 'i18n' (https://gerrit.wikimedia.org/r/pywikibot/i18n) registered for path 'scripts/i18n'
Cloning into 'C:/Pywikibot-dev/core/scripts/i18n'...
remote: Counting objects: 30, done
remote: Finding sources: 100% (87769/87769)
remote: Getting sizes: 100% (1973/1973)
remote: Compressing objects: 100% (738701/738701)
Receiving objects: 100% (87769/87769), 40.09 MiB | 1.87 MiB/s, done.
remote: Total 87769 (delta 68398), reused 87582 (delta 68239)
Resolving deltas: 100% (68398/68398), done.
error: RPC failed; HTTP 500 curl 22 The requested URL returned error: 500
fatal: expected 'acknowledgments'
fatal: Fetched in submodule path 'scripts/i18n', but it did not contain bbf1161a0340097515684d0be835804fa06f0bea. Direct fetching of that commit fail
ed.