A recent discussion was started about Language/Message updates, which disturbed developing and broke commits due to conflicts, see
http://article.gmane.org/gmane.science.linguistics.wikipedia.technical/53848
My ad-hoc proposal: "prevent LU update" file as a flag to prevent from unexpected languages/messages during agile development.
The updaters should respect a kind of PREVENT-UPDATE-UNTIL-<TIMESTAMP-UTC> file flag in the language and message directories of the core and the extensions.
Tom
Version: unspecified
Severity: enhancement