[Enhancement] Add the messages for failing to open a chest cavity into lang files

[puncrafter]

This may seem like an odd change to make, but I was considering making a modpack that would utilize resource packs and recipe editing to heavily reflavor this mod, and while most of the mod's content's text is editable in the en_us lang file, the messages "the target's chest is obstructed", and "target is too healthy to open" are not editable.