After logging to webmail with Slovak language interface selected and try to reply to a message, in new opened (compose) window, there is no quoted message. Box for writing message body is empty.
Same for both - html and plaintext message format ("Compose in" user preference).

sogo.log contains:
...: <0x0x7f9912cc90d8[WOComponentDefinition]> Note: did not find component class with name 'SOGoMailSlovakReply'
...: <0x0x7f9912cc90d8[WOComponentDefinition]> Note: missing class for component: 'SOGoMailSlovakReply'

Same for forwarding message:
...: <0x0x7f9912efada8[WOComponentDefinition]> Note: did not find component class with name 'SOGoMailSlovakForward'
...: <0x0x7f9912efada8[WOComponentDefinition]> Note: missing class for component: 'SOGoMailSlovakForward'

After selecting (for example) Czech lanuage at login screen, reply and forward contains quoted message.

I found, there are directories missing /usr/lib64/GNUstep/SOGo/Mailer.SOGo/Resources/SOGoMailSlovakReply.wo and /usr/lib64/GNUstep/SOGo/Mailer.SOGo/Resources/SOGoMailSlovakForward.wo

I tryied to create them from Czech version templates (word 'Czech' replaced with 'Slovak' in directory and file names), restarted SOGo, logged again, but nothing changes (missing quoted text, same log messages).