Here’s some suggestions I have after having reviewed all sentences in Danish.
A better UI, more like the clip recorder/validator where you get one sentence and then click yes/no. Gets tiring to click up - up - up - next page - up - up - down - repeat etc.
Visibility of the requirements directly on the review page, and upload page. I had to go through a lot of bad and broken sentences.
(!!) Randomization of the order of sentences to review (or at least some kind of algorithmic mix-up of the order). So instead of having to go through 50-100 sentences from the same boring text and then stopping, it will be more fun/encouraging to do more if they are mixed up. + there will be more diversity in the sentences being validated.
As an example for Danish right now: 641 total sentences. Only 80 validated sentences. If I understand the tool correctly those 80 sentences are most likely just among the ones to get added early on. So if I add 100 new quality sentences they will just get added to the end of the queue, and people will still have to validate all the sentences before it. And if one user uploads 200 really bad sentences early on, every user will have to go through them until they are validated or discarded.
I hope it makes sense!
More visibility/links to find this tool from the main site would be great. Like directly on this page https://voice.mozilla.org/da (or any other language without enough sentences)