I can do it!) I transferred table 'languages' from tables.py to db.py, 
becouse I need use it in extra_fields when tables.py file is not still 
included.
db.py
db.define_table(
    'languages',
    Field('NAME',length=30)
)
auth.settings.extra_fields['auth_user']= [Field('language','reference 
languages',label=T('Language'),requires = IS_IN_DB(db,db.languages.id,
'%(NAME)s'))]
Result was like on picture, but I want to ask why I had one empty option in 
select? Is there way to exclude it?  

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