Please remove the line
https://git.wikimedia.org/blob/mediawiki%2Fextensions%2FSlippyMap/4d7dcb7ada060419106385a2fa545aa5ff7fcec9/SlippyMap.i18n.php#L1228
as I did on a few other extensions (e.g. [1]).
I tried to fix this myself but I got an error:
Cloning into 'SlippyMap'...
fatal: Project not found: mediawiki/extensions/SlippyMap
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.
[1] https://gerrit.wikimedia.org/r/#/c/108932/1/AbuseFilter.i18n.php,unified
Version: unspecified
Severity: normal