yeah i forgot about the en_US.lang
i couldnt find anything wrong with the names so i deleted something and downloaded the workspace from then tutorial i watched. first it worked but then i changed a bit and it stopped working. i downloaded it again but now, even if i change nothing, the item is missing. (the other items are still there)
looks like i will just delete everything and not only src. good that i still got my 1.7.10 version