Date/Time language


I just installed invoiceninja on my new VPS, everything great ! so fast with php7. I change the language to french without a problem but I noticed that some date/time are still in english. I search for 2 hours how to change it but I cannot thing my way.
I think it is linked to the mysql variable lc_time_names

But I cannot find a way to use that settings to make Invoiceninja use it.

How can I change this so the date are also in fr_CH ?



Our app doesn’t support it, there’s more info here:

You’d need to use a date format which is just numbers.