Remove the old logger which means you can longer read old logs. This is fine since purple3 no longerg uses the share config directory as purple2 and in fact requires the ui to set it. This means old data won't be there.
# SOME DESCRIPTIVE TITLE.
# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
# This file is distributed under the same license as the PACKAGE package.
#
# Translators:
# F Wolff <friedel@translate.org.za>, 2006-2009, 2010-2011
# Samuel Murray <afrikaans BY gmail.com>, 2007
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"Project-Id-Version: Pidgin\n"
"Report-Msgid-Bugs-To: \n"
"POT-Creation-Date: 2019-11-10 20:23-0500\n"
"PO-Revision-Date: 2017-09-19 19:20+0000\n"
"Last-Translator: Richard Laager <rlaager@wiktel.com>\n"