more than irritated actually. 
It is from a English speaking family living out of the UK, the children are older teens. They have turbulent relationship with each other.
Their 'Christmas' card shows a photo of the 4 of them, all smiling grimacing. The words inside are printed and are not in English. It ends with their names, not 'love from' or similar. Nothing has been added by hand.
I really want to respond by sending them a text in some language they won't understand, but DH thinks that is a step too far. 
Heri ya Krismasi na Mwaka Mpya na wewe kila