Mass mailing - subject is empty if non-english characters used (ě,š,č,ř,ž,ý...) but not empty without non-english characters

Question

Hi, in Odoo 11 (CE)  Mass mail I have problem with non-english characters in email subject. If there are non-english characters ( ě,š,č,ř,ž,ý... ) email is sent with empty Subject. Wihout this characters, Subject is filled and send correctly.
Any help how to fix?
Thanks.

Hilar Andikkadavath · Accepted Answer

Normally the umlaute characters can be handled using following script on python.
import sys
reload(sys)
sys.setdefaultencoding('utf-8') # to treat the Umlaute for HTML use
<META HTTP-EQUIV="content-type" CONTENT="text/html; charset=utf-8">

siD · Answer

thanks, but I do not understand.... (I am not dev).  Do I need to modify the source code? Where?
I test Odoo 10, there is mass mail sending with non-english characters OK.
I simply install Odoo (on Ubuntu 16.04), activate MassMail module, create Mass mail, send.....
Thanks.

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