Hi thanks for your answer!
Well the point is I haven’t found anything about that command. If it ever existed with a simple “Execute console command” node would have been more than enough to change the game’s culture but I can’t seem to find it. What I have found (and tested and yes, it is working) is that you can pass “-culture=fr” on the commandline when launching the game and that works (I set in a shortcut). I have found in the answer HUB How do I test translations with console commands? - Rendering - Epic Developer Community Forums but the console command “-culture=fr” doesn’t work for me in the console(not recognized with and without the quotes).
Btw, I found something really usefull in terms of localization: when you use the gather text commandlet now it also gathers the soundwaves and the soundcues! The guys from Solus were having problems but it seems Epic Games fixed it (just posting here so people who end here getting info on the subject can read it 
)
, setting the subtitles on and off in runntime should be super easy in C++ because in the project settings menu there is indeed and option to set the subtitles on and off and well, if you have managed to do blueprints to rebind keys during runntimes subtitles should be really easy.
Keep on the good workk!! I can’t wait to show you guys what I am doing 