We usually forget to update it. I think we should replace it by using the translation infrastructure. I think we could use #3672 (closed) to register day of the week and the month names.
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Indeed I do not think we should use ir.message for that but we should create two tables with the months and the week days. Because it happens that we need them to fill a field. Often the solution is to create a Selection field and list using calendar module but it requires to translate them multiple times.