When I think of the languages that I speak regularly, I can't really think of a context where I would call myself a student of aikido.
In Finnish I'd say something like "Minš harrastan aikidoa" which translates as "I do aikido (as a hobby)".
In Dutch I'd just say "Ik doe aikido" "I do aikido". In English I guess it's more correct English to say I practice aikido in that case?
To call myself a student in one of those two languages would sound like I study it more or less full time in some kind of an institution like a college or something.
Though native Dutch speakers might disagree. Feel free.