I installed the simplified Chinese language pack in version 3.9
After the successful installation, the product edit page cannot be opened.
Many errors were displayed in the log:
Resource string (admin.pager.refresh) is not found. Language ID = 3
Resource string (admin.pager.itemsperpage) is not found. Language ID = 3
Resource string (admin.catalog.products.fields.discounts) is not found. Language ID = 3
Resource string (admin.catalog.products.fields.manufacturers) is not found. Language ID = 3
Resource string (admin.catalog.products.fields.categories) is not found. Language ID = 3
Resource string (admin.catalog.products.fields.productavailabilityrange) is not found. Language ID = 3
Resource string (admin.configuration.settings.producteditor.availablestartdate) is not found. Language ID = 3
Resource string (admin.configuration.settings.producteditor.id) is not found. Language ID = 3
I don't know why, how should I solve it?