refactor(locale): clean up unnecessary metadata in French translation files

Author: PierreRaybaut

doc/locale/fr/LC_MESSAGES/features/signal/menu_analysis.po

@@ -5,18 +5,11 @@
 #
 msgid ""
 msgstr ""
-"Project-Id-Version: PROJECT VERSION\n"
-"Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
-"POT-Creation-Date: 2026-05-14 16:10+0200\n"
-"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
-"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language: fr\n"
-"Language-Team: fr <LL@li.org>\n"
 "Plural-Forms: nplurals=2; plural=(n > 1);\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=utf-8\n"
 "Content-Transfer-Encoding: 8bit\n"
-"Generated-By: Babel 2.18.0\n"
 
 msgid "Analysis features on Signals"
 msgstr "Analyse sur les signaux"

doc/locale/fr/LC_MESSAGES/features/signal/menu_operations.po

@@ -6,18 +6,11 @@
 #, fuzzy
 msgid ""
 msgstr ""
-"Project-Id-Version: PROJECT VERSION\n"
-"Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
-"POT-Creation-Date: 2026-05-14 15:28+0200\n"
-"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
-"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language: fr\n"
-"Language-Team: fr <LL@li.org>\n"
 "Plural-Forms: nplurals=2; plural=(n > 1);\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=utf-8\n"
 "Content-Transfer-Encoding: 8bit\n"
-"Generated-By: Babel 2.18.0\n"
 
 msgid "Operations on Signals"
 msgstr "Opérations sur les signaux"

doc/locale/fr/LC_MESSAGES/intro/tutorials/spectrum.po

@@ -6,18 +6,11 @@
 #, fuzzy
 msgid ""
 msgstr ""
-"Project-Id-Version: PROJECT VERSION\n"
-"Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
-"POT-Creation-Date: 2026-05-14 15:28+0200\n"
-"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
-"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language: fr\n"
-"Language-Team: fr <LL@li.org>\n"
 "Plural-Forms: nplurals=2; plural=(n > 1);\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=utf-8\n"
 "Content-Transfer-Encoding: 8bit\n"
-"Generated-By: Babel 2.18.0\n"
 
 msgid ""
 "Tutorial on how to process a spectrum with DataLab, the open-source "