Update extending/building.po

Author: cmaureir

extending/building.po

@@ -8,7 +8,7 @@
 #
 msgid ""
 msgstr ""
-"Project-Id-Version: \n"
+"Project-Id-Version: Python 3.8\n"
 "Report-Msgid-Bugs-To: \n"
 "POT-Creation-Date: 2020-05-05 12:54+0200\n"
 "PO-Revision-Date: 2020-06-24 22:47+0200\n"