Merge pull request elapouya#527 from dralexxx/update_jinja2_version

regen pipfile.lock with newer jinja2 dependency version

PR elapouya#493

Merge pull request elapouya#482 from dreizehnutters/master

fixed element properties for highlighted text

remove unused code in doc_properties.py

Reorganize documentation

update changelog

PR elapouya#427

Merge pull request elapouya#402 from 42sol-eu/master

Add documentation for get_undeclared_template_variables() method

remove f-string for python < 3.6 compability

Fix elapouya#398