cubicweb-seda #17106805 rectrict languages vocabulary [validation pending]

to get only languages supported by seda 0.2

Until we get a better UI to support concepts with different SEDA level

prioritynormal
typebug
done in0.11.0
load left0.000
closed by#65b1b03e6219 [migration] Add migration script to update language vocabulary, #ba6a36fa1ce7 [skos] Restrict the default languages vocabulary