Yuki Takei 15274b90d2 remove MATHJAX env var and replace with KaTeX 3 lat temu
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en_US 15274b90d2 remove MATHJAX env var and replace with KaTeX 3 lat temu
ja_JP 15274b90d2 remove MATHJAX env var and replace with KaTeX 3 lat temu
zh_CN 15274b90d2 remove MATHJAX env var and replace with KaTeX 3 lat temu