[REFACTOR] Migrate usage of custom dates format

[ansmonjol]

Function formatDateToTZ and formatTimeOrgaTZ are deprecated and should be replaced by intlFormatDateTime
It has all it needs to get custom format built on the go

Also some custom usage of Datetime can be found in the app and probably replaced (found one in the apiKeys list for example)

When replacing there might be some very small diff, like the absence of a dot after the month short name, but that is intended