Dating en language language nl nl site venlo
Renaming the standard en language to en-US is easily done.
It leads however to a broken content management experience: after all all system items have been created in en rather than en-US.
In 1929, the government ordered that all pre-1811 records be sent to the state archives and most parishes complied with this new rule.
The problem with this approach is that content managers would end up seeing two English languages in the CMS.