Strange error on pos v7

when i change the language to arabic and launch the pos its working but it never sync the invoices and keep it in the cache and show me this error

Traceback (most recent call last):
File “/home/frappe/cmms/apps/frappe/frappe/”, line 55, in application
response = frappe.handler.handle()
File “/home/frappe/cmms/apps/frappe/frappe/”, line 19, in handle
File “/home/frappe/cmms/apps/frappe/frappe/”, line 40, in execute_cmd
ret =, **frappe.form_dict)
File “/home/frappe/cmms/apps/frappe/frappe/”, line 901, in call
return fn(*args, **newargs)
File “/home/frappe/cmms/apps/erpnext/erpnext/accounts/doctype/sales_invoice/”, line 263, in make_invoice
submit_invoice(si_doc, name)
File “/home/frappe/cmms/apps/erpnext/erpnext/accounts/doctype/sales_invoice/”, line 307, in submit_invoice
save_invoice(e, si_doc, name)
File “/home/frappe/cmms/apps/erpnext/erpnext/accounts/doctype/sales_invoice/”, line 313, in save_invoice
File “/home/frappe/cmms/apps/frappe/frappe/model/”, line 212, in insert
File “/home/frappe/cmms/apps/frappe/frappe/model/”, line 770, in run_post_save_methods
File “/home/frappe/cmms/apps/frappe/frappe/model/”, line 651, in run_method
out = Document.hook(fn)(self, *args, **kwargs)
File “/home/frappe/cmms/apps/frappe/frappe/model/”, line 860, in composer
return composed(self, method, *args, **kwargs)
File “/home/frappe/cmms/apps/frappe/frappe/model/”, line 845, in runner
add_to_return_value(self, f(self, method, *args, **kwargs))
File “/home/frappe/cmms/apps/frappe/frappe/core/doctype/communication/”, line 26, in update_feed
feed = doc.get_feed()
File “/home/frappe/cmms/apps/erpnext/erpnext/controllers/”, line 24, in get_feed
ValueError: unmatched ‘{’ in format

Please report this on github

@rmehta please help on this

Have you created an issue on github?

the error was in the translation file it self , thx for your help