How to remove letter head and set default language form print

for print format sales invoice html
i set the default language is Arabic
but when print the default language is English ??
and form this print format i want to remove the letter head

Hi @Manal_Al-Subaei,

Sales invoice html is the custom print format then set the default language.

I hope this helps.

Thank You!

does not work in sales invoice

i remove the letter head from print format in custom css by this code
.print-format .letter-head { display:none; }