implement tvar & cleanup (#11)

* implement tvar & cleanup
* Fix file processing
* Wrap <code> tag in tvar
* Update function descriptions
* Update app.py
Improve _wrap_in_translate
* Add icon parsing and more
* Update tests introducing tvars and more; see also: https://meta.wikimedia.org/wiki/Meta:Internationalization_guidelines

* Add new tests

* debug item processing

* Cleanup debug prints

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Co-authored-by: ftosoni <francitosoni@gmail.com>

Author: super-nabla