* add lanaguage classifier node
* Fix a few bugs and general code style
* whitespace
* first draft and refactoring
* draft of classes separation
* improve base class
* fix inivisible character; add some tests
* fix and more tests
* more docs and tests
* move __init__ to base
* add transformers node; improve tests
* incorporate feedback; little fix to other node
* labels_to_languages mapping
* better docstrings
* use logger instead of logging
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Co-authored-by: Stanislav Zamecnik <stanislav.zamecnik@telekom.com>
Co-authored-by: anakin87 <44616784+anakin87@users.noreply.github.com>
Co-authored-by: stazam <zamecnik.stanislav@gmail.com>
