Update German translations in index.po

Translation of the first 3 missing msgID.

Author: sba72

installing/index.po

@@ -12,7 +12,7 @@ msgstr ""
 "Project-Id-Version: Python 3.14\n"
 "Report-Msgid-Bugs-To: \n"
 "POT-Creation-Date: 2025-10-25 14:12+0000\n"
-"PO-Revision-Date: 2025-09-16 00:00+0000\n"
+"PO-Revision-Date: 2026-06-03 00:00+0000\n"
 "Last-Translator: python-doc bot, 2025\n"
 "Language-Team: German (https://app.transifex.com/python-doc/teams/5390/de/)\n"
 "MIME-Version: 1.0\n"
@@ -22,13 +22,13 @@ msgstr ""
 "Plural-Forms: nplurals=2; plural=(n != 1);\n"
 
 msgid "Installing Python Modules"
-msgstr ""
+msgstr "Installieren von Python-Modulen"
 
 msgid "Email"
-msgstr ""
+msgstr "E-Mail"
 
 msgid "distutils-sig@python.org"
-msgstr ""
+msgstr "distutils-sig@python.org"
 
 msgid ""
 "As a popular open source development project, Python has an active "