Crash on launch, freeing invalid pointer in i18n.c

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Probably related to the hbo asan finds:

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it's an off by one when you realloc on line 553 in i18n.c, + 9 bytes forgets about the \0 terminator I think (+ 10 shuts asan up at least). I'd just add 255 bytes to avoid having to care about it, though, it's not like it matters.

now I'm getting a uaf, though, with -sdl2, the others seem to work: