User-visible SPA routes were a mix of English and Norwegian. Bring
them in line with the rest of the project's language:
/home → /hjem
/a/:id → /aktivitet/:id
/<username>/list → /<username>/liste
/tags/:tag → /etiketter/:etikett
/invite/:token → /invitasjon/:token
The English forms remain accepted by the SPA router (parsePath) and
the server OG handlers so links shared before the rename — invite
URLs in particular — still resolve. Outgoing links always use the
Norwegian forms. API paths (/api/users/:username/list etc.) stay in
English — they're internal contracts between client and server, not
user-visible URLs.
Server OG registration orders /<username>/liste before /aktivitet/:id
so a hypothetical user with the slug "aktivitet" still gets their
profile page rather than an activity-not-found. For normal activity
URLs the user-list route doesn't match (second segment must be the
literal "liste").
Profile copy referencing the URL slug also updated.