Translation:
Several days after the battle with Zamasu, Trunks and Mai are preparing to permanently live at Bulma's, until Gohan stops by...
Gohan says he wants to see Trunks' peaceful future and meet the Bulma there, so Trunks changes plans and decides to go back to the future (he doesn't admit to Gohan he changed plans, he just acts like this was his idea all along)
Also before they decide to leave, Bulma's says future Mai living there will be like gaining a daughter. Like that will ever happen...
And Gohan's reason for stoping by Bulma's: he's started training in the gravity room, he wants to be of help when there's trouble. He's noticed that lately nobody contacts him when there's fighting to be done.