Fields label are not translated in doctype edition form

Hello Frappe Community.

I’ve got some troubles about translations in ERPNext.

I have my .po file in apps/erpnext/erpnext/locale, which contains all translatable texts.

After the build, i found out that fields label are not translated in the edit doctype form, even if they are specified in the .po file.

Anyone has ever found a solution ?