This bug was fixed in the package python-babel - 2.6.0+dfsg.1-1ubuntu2
--------------- python-babel (2.6.0+dfsg.1-1ubuntu2) focal; urgency=medium
* d/rules: Generate locale data using python3, resolving FTBFS (LP: #1870072).
-- James Page <email address hidden> Fri, 03 Apr 2020 11:29:13 +0100
This bug was fixed in the package python-babel - 2.6.0+dfsg. 1-1ubuntu2
--------------- dfsg.1- 1ubuntu2) focal; urgency=medium
python-babel (2.6.0+
* d/rules: Generate locale data using python3, resolving FTBFS
(LP: #1870072).
-- James Page <email address hidden> Fri, 03 Apr 2020 11:29:13 +0100