use a globally unique id when creating new Pidgin::DisplayItem's
Use a globally unique id when creating new `Pidgin::DisplayItem`s as the doc demands and as discussed on [discourse](https://discourse.imfreedom.org/t/how-is-pidgin-id-supposed-to-be-unique/134/2)
Testing Done:
Ran Pidgin and opened a conversation.
Reviewed at https://reviews.imfreedom.org/r/2980/
# SOME DESCRIPTIVE TITLE.
# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
# This file is distributed under the same license as the PACKAGE package.
#
# Translators:
# Mohamad Hasan Al Banna <se7entime@openmailbox.org>, 2013
# Rai S. Regawa <raireg@yahoo.com>, 2012
msgid""
msgstr""
"Project-Id-Version: Pidgin\n"
"Report-Msgid-Bugs-To: \n"
"POT-Creation-Date: 2023-10-31 03:13-0500\n"
"PO-Revision-Date: 2017-09-19 14:02+0000\n"
"Last-Translator: Richard Laager <rlaager@wiktel.com>\n"
"Language-Team: Indonesian (http://www.transifex.com/pidgin/pidgin/language/"
"id/)\n"
"Language: id\n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=UTF-8\n"
"Content-Transfer-Encoding: 8bit\n"
"Plural-Forms: nplurals=1; plural=0;\n"
#. Translators may want to transliterate the name.