ROM Hack Help editing text for Japanese games

[Stardustmaster]

Hello, I am trying to edit some text into games and I was just wondering which software I need to use to input the text and put it back so it works on the game. Thanks and any input is appreciated.

 

[FAST6191]

Have a read of older text editing tutorials, things from other file systems using devices (so the DS and PSP for something somewhat recent). Unless the game in question has already been hacked (so on the 3ds probably fire emblem, pokemon, smash brothers, mario kart, Terry's Wonderland and a few others I might have forgotten) you will have to go manual and possibly make your own tools. There is certainly not a common format used across all games and a tool/tools to edit it.
http://gbatemp.net/threads/gbatemp-rom-hacking-documentation-project-new-2016-edition-out.73394/
http://www.romhacking.net/start/