Include the previous translators in the header and update some of the placeholders.

Signed-off-by: Matthias Aßhauer <mha1993@live.de>

The script looks for known safe non-translatable segments and
automatically converts them.

Currently translated at 17.5% (1713 of 9770 strings)

Translation: Git Manpages/Translations
Translate-URL: https://hosted.weblate.org/projects/git-manpages/translations/fr/

Currently translated at 2.5% (246 of 9770 strings)

Translation: Git Manpages/Translations
Translate-URL: https://hosted.weblate.org/projects/git-manpages/translations/fr/

The translation of configuration and environment  variables, git
commands and cross-links was pushed automatically.

This is not needed by Asciidoctor and it is not understood by asciidoc

* when calling from withing git's Documentation dir, using bundler
  might not be desired.
* encapsulating recursive Makefile calls inside bundler breaks the job
  server of GNU make and generates a warning.

There is no need to use a subshell for redirection; just redirect the output from the "cat" command directly.

This is a gettextization of https://repo.or.cz/gitman-de.git. Need review

Currently translated at 1.9% (187 of 9770 strings)

Translation: Git Manpages/Translations
Translate-URL: https://hosted.weblate.org/projects/git-manpages/translations/fr/

This is the same as the license for Git.

Signed-off-by: Jean-Noël Avila <jn.avila@free.fr>