You can use the xgettext -a, --extract-all
flag to extract all quoted strings in your XML file.
In POEdit, create a new parser that looks for XML files:
Under Preferences, go to the Parsers tab and hit New. Then enter:
Language:
XML
List of extensions separated by semicolons:
*.xml
Parser command:
xgettext -LC --extract-all -o %o %C %F
An item in keywords list: - leave empty
Item in input files list:
%f
source code charset:
--from-code=%c
And hit OK.
Make sure you add the path where your XML lives to you PO file propeties and you should be able to run Catalogue > Update from sources
This should forcefully extract any quoted strings into your PO file.