Misc improvements
Misc improvements

- Support fot multiple languages in heading (raw)
- Support for replacing with a list of etree elements in advreplace

tomchipchase/python-docx,adnelson/docx-text-replacement,toshka/python-docx,mikemaccana/python-docx,adnelson/docx-text-replacement,firebitsbr/python-docx,mouthwateringmedia/python-docx,psquickitprageet/python-docx