Option of number of n-grams shown

[martinpopel]

Reviewer2 wrote:

Would you be able to add a "load more" option? Users might be interested in displaying more than the top ten n-grams.

I think these non/confirmed n-grams need to be precomupted, but maybe we can set the precompute constant to e.g. 100 and add "show more" button to the online interface (while preserving 10 as the default number shown).