[ngrams table] add queryExactMatches to make "add" button work

correctly

It should show if there are search results, but don't match the search
query exactly (modulo normalization).
Status Job ID Name Coverage
  Test
failed #2840
deps

failed #2841
test

 
Name Stage Failure
failed
test Test There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job trace
failed
deps Test There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job trace