Originalan tekst - Hrvatski - sa velikan tugan u boli u sicer serima vana kope...

my god... ok, half of this is not understandable, but here's what i understand -
first one:
with great sadness in our hearts to you that I love (..........) love in thoughts with us

the second one is slightly better:

"we lost a wonderful man, a friend, but he will be forever remembered in our hearts and thoughts! sincere condolences from all of us!
In thoughts with you"

It would explain a lot if these letters were written in 18th century? I'm serious.

Is this Croation I don't think so.

I've set it in "meaning only", and thanks to your bridge Maski, I'll validate the French version from it.