How to create pot file from an odt file

1) Open with kword the odt file and save it as uncompressed xml file as SalixStartUpGuide.xml
It will create a folder with the given name (SalixStartUpGuide.xml) in above step and inside this folder it will be a content.xml file.

2) Then use this file to create the pot file with the command
 xml2po -e -o file_name.pot SalixStartUpGuide.xml/content.xml

3) If you want to merge the file with the old one, download from transifex the corresponding language po file from previous version of SalixStartUpGuide and open it with  poedit.
 And go to "Folder"-> Upgrade from POT file and choose the above file_name.pot.
 And you will have the merged final po file with old translated strings and new ones which need translation.