Luxembourgish not working with the Languages template

Question

The Languages template does not seem to accept the value "lb". "lb" is the proper ISO 639-1 code for the Luxembourgish language and WikiTree has at least one native Luxembourgish speaker who would like to use it.

I don't see anything on the documentation that says the language selection is limited. 

Could someone familiar with the template please have a look and see what is wrong, please? It would be much appreciated. Thank you!

Comments

A template called "User lb" has to be created, with 5 messages, from "I am a native speaker of Luxembourgish" down to "I don't understand a word of it", but in Luxembourgish not English.

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Of course!... The ball is still in the Templates project's camp then.