new fields for join form

I have a problem with the fields.  I've managed to create them but when I go to the "join page", the fields'names look like that : _FieldCaption_Test_Join

How to put "test" instead of "_FieldCaption_Test_Join"?

In the fields builder, I just wrote test and test in "name" and "caption".

You just need to create these new language keys within your Admin Panel - Settings - Languages settings ;-)