Not for the fingerprint appointment
At the appointment you bring passport, decision, fee, photos and EX-17. Nobody asks for an apostilled certificate there. The apostille belongs to the earlier stage: the file you submit for the permit, where many family-reunification and partnership cases fall down.
Two routes
Hague apostille, if the country signed the 1961 Convention: one step at origin, no consulate.
Consular legalisation, if it didn’t: several chained stamps, the last from the Spanish consulate.
You don’t choose: each country has its own route.
Between EU countries
For the most common certificates — birth, marriage, criminal record — neither is needed thanks to Regulation (EU) 2016/1191, which also offers multilingual forms that avoid translation.
Translation comes last
First apostille or legalise; then have everything, stamps included, translated by a sworn translator. Translating first means doing it again.
General information, not legal advice. For questions about your own case, check the decision you were sent or ask a professional.