Since you have more than one board language installed, you now can change or add the remaining language items too. The profile field will work with the default language enabled.
Can someone tell me, please, what exactly the second line
The profile field will work with the default language enabled.mean?
I mean, there is always some default language selected on the board, isn't it? If I'm correct, there is no need for this sentence. But it is here, so there must be some reason for it and I'm probably missing something.