This, but it should also be possible for people to add new languages, because no pre-determined list will ever cover all options.
For instance, the the list in the OP mentioned "recognised regional languages" for the UK and included Scots Gaelic, but did not include Scots. Some say that's simply a dialect of English, some say it's a language, but regardless the point is that some people will want to put languages that we don't anticipate[1], and I think that in the general spirit of DW they should be able to.
As soon as people are allowed to add things, then we get straight back to the issue of how to prevent duplicates. I don't know the solution to that; I suspect there isn't a perfect one, short of asking people to request new languages through a support ticket, but because most users will only ever want to add a new language once I think it's reasonable to ask them to jump through some hoops.
[1] This spawns another question of fictional languages. I'm sure there must be at least one user out there who posts in Klingon or Tolkein Elvish. My gut feeling is "sure, why not?".
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For instance, the the list in the OP mentioned "recognised regional languages" for the UK and included Scots Gaelic, but did not include Scots. Some say that's simply a dialect of English, some say it's a language, but regardless the point is that some people will want to put languages that we don't anticipate[1], and I think that in the general spirit of DW they should be able to.
As soon as people are allowed to add things, then we get straight back to the issue of how to prevent duplicates. I don't know the solution to that; I suspect there isn't a perfect one, short of asking people to request new languages through a support ticket, but because most users will only ever want to add a new language once I think it's reasonable to ask them to jump through some hoops.
[1] This spawns another question of fictional languages. I'm sure there must be at least one user out there who posts in Klingon or Tolkein Elvish. My gut feeling is "sure, why not?".