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And "koláče" is already plural, no need for the "s" at the end :)

That's not why they put the e there. It's just formed the same way as couch -> couches. And English e represents i anyway, not e.

I guess it is an anglicisation of the word, czech spelling and grammar are not so widely known outside Czech Republic.

I have seen similar quirks going from English into Czech. Like how there is "sendvič" for sandwich, and "sendviče" for sandwiches ... I've seen some places here advertising "sandwiche" (applying the Czech plural to the English stem).

Or even non-pastries - mrkvový koláč

Oh, that's interesting. In austria, basically all pastry comes from Czech. The “Topfengulatsche“ is a box shaped pastry filled with curd, now I know what “Gulatsche“ actually means.