Kirjoita aloituskehotteet -> Kirjoita aloituskehote OR Kirjoita aloitusviesti (aloitusviesti is used elsewhere, so maybe its best to stay consistent)
Lajittele aloitusviesti -> Arvioi aloitusviesti
Onko tämä viesti spämmiä? -> Onko tämä viesti roskapostia? (Not sure is roskaposti is the best word to use, but spämmi sound a bit too casual)
Kieli ei ole Suomi -> Kieli ei ole suomi (no capitalization for languages)
After first logging in, it's unclear what the user should do. The most obvious is clicking "create_chat", but that button does not work. Next, the user is likely to click one of the sponsor links that take the user to another site. There should probably be some kind of "Start here" page, where the guidelines for writing prompts etc. are given.
After repeatedly refreshing the page, all the tasks become unavailable. The start page says, for example, "5 tehtävää saatavilla" but when cliking on a task to start it, it tells me "Uusia tehtäviä ei löytynyt."
When I tried to register to use the service via https://avoin-avustaja.fi with my [email protected] address the account validation email did not reach even the junk folder (after several tries).
When using a gmail address there was no problems. I guess there is not much you can do about this, but just FYI anyway.