bug#80886: Duplicated "Report translation bugs to" string

The coreutils 9.11 translation file may result in duplicated translated
text pointing to the language team's mailing list because lib/version-etc.c
tells the translator to append the language team's mailing list to "Report
bugs to" and src/system.h has a specific string for the language team's
mailing list.

EXAMPLE OF THE PROBLEM:

See below the trailing lines of 'tr --help' translated in Brazilian
Portuguese (pt_BR) using my yet-to-be-submitted translation file
(attached!).

Notice how the translated text 'Relate erros de tradução para..' is shown
twice.

---
Relate erros para: [email protected]
Relate erros de tradução para <
https://translationproject.org/team/pt_BR.html>
Página do GNU coreutils: <https://www.gnu.org/software/coreutils/>
Ajuda para uso de softwares GNU: <https://www.gnu.org/gethelp/>
Relate erros de tradução para <
https://translationproject.org/team/pt_BR.html>
Documentação completa em <https://www.gnu.org/software/coreutils/tr>
ou disponível localmente via: info "(coreutils) tr invocation"
---

RELATED SOURCE FILES:

src/system.h has the following string for translation:

---
Report any translation bugs to <https://translationproject.org/team/>
---

with the following comment:

---
TRANSLATORS: Replace LANG_CODE in this URL with your language code
<https://translationproject.org/team/LANG_CODE.html> to form one of
the URLs at https://translationproject.org/team/.  Otherwise, replace
the entire URL with your translation team's email address.
---

And lib/version-etc.c has the following string for translation:

---
Report bugs to: %s
---

with the following comment:

---
TRANSLATORS: The placeholder indicates the bug-reporting address
for this package.  Please add _another line_ saying
"Report translation bugs to <...>\n" with the address for translation
bugs (typically your translation team's web or email address).
---