How difficult would it be to leave it a blank and make them name it.
A little because the names are used in links, for example in the Daily Hero, and you cannot click an empty name
Maybe I can just give "Mission #128" as a name.
Okay, I was unclear here. When I learned a skill in the bar, I went to look at the information about that skill. It told me I don't know that skill. It just needs a little tweaking to say, 'You must learn more about this skill before you understand how to use it.' Something like that at least.
I changed that into:
"I believe that I need to study it a little bit more to know the details of this skill."
is it clear?
I also changed the other translation, great!