Updated translator credits in de and it po files

Combined legacy entries of same translators into single lines
for readability.

po/de.po

@@ -3,12 +3,9 @@
 # This file is distributed under the same license as the picard project.
 #
 # Translators:
-# nikki, 2014-2015
-# nikki2 <[email protected]>, 2012
 # Björn Krombholz <[email protected]>, 2006
 # c8ba6e46576070595b2ba64068f9a431_0cfbcb2, 2012,2015
 # Daniel Theis <[email protected]>, 2017
-# Daniel Theis <[email protected]>, 2017
 # David Kellner <[email protected]>, 2019-2020
 # Eckhard Henkel <[email protected]>, 2018
 # Ettore Atalan <[email protected]>, 2014,2018
@@ -18,30 +15,18 @@
 # happykraut, 2017
 # HumHumXX, 2012,2015
 # ix5, 2017
-# ix5, 2017
-# ix5, 2017
-# happykraut, 2017
 # Marc Rodrigues <[email protected]>, 2019
 # Mark Spike, 2019
-# Mark Spike, 2019
 # Matthias W. <[email protected]>, 2018
-# nikki, 2013
+# nikki, 2013-2015
 # nikki2 <[email protected]>, 2012
-# nikki, 2013
 # Philipp Wolfer <[email protected]>, 2014,2017-2023
 # S.Brandt <[email protected]>, 2014-2015,2017-2018
-# Shepard, 2012
+# Shepard, 2012-2014
 # Simon Legner <[email protected]>, 2018
-# Shepard, 2013-2014
-# Shepard, 2012
-# Wieland Hoffmann <[email protected]>, 2012
-# TL, 2019
 # TL, 2019
 # Tobias Sarner <[email protected]>, 2020
 # Wieland Hoffmann <[email protected]>, 2012-2013,2015,2017
-# Daniel Theis <[email protected]>, 2017
-# c8ba6e46576070595b2ba64068f9a431_0cfbcb2, 2015
-# c8ba6e46576070595b2ba64068f9a431_0cfbcb2, 2012
 msgid ""
 msgstr ""
 "Project-Id-Version: MusicBrainz\n"

po/it.po

@@ -4,14 +4,9 @@
 #
 # Translators:
 # Andrea Borio <[email protected]>, 2016
-# salo.rock, 2012,2017-2022
 # Matte <[email protected]>, 2006
 # Philipp Wolfer <[email protected]>, 2019-2023
-# salo.rock, 2013-2015
-# salo.rock, 2012
-# salo.rock, 2021-2023
-# "salo.rock" <[email protected]>, 2023.
-# "salo.rock" <[email protected]>, 2023.
+# "salo.rock" <[email protected]>, 2012-2015,2017-2023.
 msgid ""
 msgstr ""
 "Project-Id-Version: MusicBrainz\n"