Well watching the original can be considered a bit of a leftover from the amine/manga fandom where there's still infighting about whether can be a proper fan and still watch the subs.
I think there's a lot more people writing in their native tongues in the football slash communities. I know my friend ran a German archive at one point! But as you say, people will be a lot more familiar with the technical terms in sports fandoms than traditional fandoms. Especially when you have jokes that make sense in English (e.g. Diagon Alley or Nocturne Alley) but won't necessarily translate well.
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I think there's a lot more people writing in their native tongues in the football slash communities. I know my friend ran a German archive at one point! But as you say, people will be a lot more familiar with the technical terms in sports fandoms than traditional fandoms. Especially when you have jokes that make sense in English (e.g. Diagon Alley or Nocturne Alley) but won't necessarily translate well.