Change limit for the first request in TM Maintenance

Now after pressing "Search" in TM Maintenance we send the first request with limit of 20 segments and after it is done we send a request for reading the total amount. After the user scrolls to the end of the grid we then send requests for reading segments one-by-one in bunches of 20. This leads that the first request till the result appears after a longer time for big TMS.

This behaviour needs to be changed the following way:
After "Search" is pressed need to read first bunch of segments not in one request, but using the same approach as when scrolled to the end of the page - in 20 requests on-by-one. Regarding "read amount" - it should be sent after the first 20 is read.