The replacement string has to be the same length or shorter, in this case.
I think I tried with spaces before the %1, and the footer came out off-center. I don't remember if spaces after the %2 made it centered again, but just removing the spaces was easier.
A side effect seems to be that it also changes the format of the "Page %1 of %2" texts in other parts of the interface (settings, search results, etc.).
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