Idioms and types in datasets and biblib

[chnaccarato]

There are several inconsistencies in datasets regarding idioms and types:

• Agul (magometov1970) = Central Agul (dialect_toplevel) in biblib, Standard Agul (language) in example_dataset
• Armenian (dum-tragut2009) = Modern Eastern Armenian in biblib, Eastern Armenian in example_dataset
• Hunzib = language (in several datasets and in biblib); I thought we use type = language only for standard languages

There might be more such cases and they should be made consistent in all datasets.