Translations update from Mattermost Weblate (#27378)

* Translated using Weblate (French)

Currently translated at 83.2% (4806 of 5772 strings)

Translation: Mattermost/webapp
Translate-URL: https://translate.mattermost.com/projects/mattermost/webapp/fr/

* Translated using Weblate (Polish)

Currently translated at 100.0% (2506 of 2506 strings)

Translation: Mattermost/server
Translate-URL: https://translate.mattermost.com/projects/mattermost/server/pl/

* Translated using Weblate (German)

Currently translated at 100.0% (2506 of 2506 strings)

Translation: Mattermost/server
Translate-URL: https://translate.mattermost.com/projects/mattermost/server/de/

* Translated using Weblate (Swedish)

Currently translated at 100.0% (2506 of 2506 strings)

Translation: Mattermost/server
Translate-URL: https://translate.mattermost.com/projects/mattermost/server/sv/

* Translated using Weblate (Japanese)

Currently translated at 100.0% (2506 of 2506 strings)

Translation: Mattermost/server
Translate-URL: https://translate.mattermost.com/projects/mattermost/server/ja/

* Translated using Weblate (Japanese)

Currently translated at 100.0% (5772 of 5772 strings)

Translation: Mattermost/webapp
Translate-URL: https://translate.mattermost.com/projects/mattermost/webapp/ja/

* Translated using Weblate (Norwegian Bokmål)

Currently translated at 3.7% (215 of 5772 strings)

Translation: Mattermost/webapp
Translate-URL: https://translate.mattermost.com/projects/mattermost/webapp/nb_NO/

* Translated using Weblate (Norwegian Bokmål)

Currently translated at 3.9% (228 of 5772 strings)

Translation: Mattermost/webapp
Translate-URL: https://translate.mattermost.com/projects/mattermost/webapp/nb_NO/

* Translated using Weblate (Norwegian Bokmål)

Currently translated at 4.3% (252 of 5772 strings)

Translation: Mattermost/webapp
Translate-URL: https://translate.mattermost.com/projects/mattermost/webapp/nb_NO/

* Translated using Weblate (Norwegian Bokmål)

Currently translated at 4.3% (252 of 5772 strings)

Translation: Mattermost/webapp
Translate-URL: https://translate.mattermost.com/projects/mattermost/webapp/nb_NO/

* Translated using Weblate (French)

Currently translated at 83.2% (4808 of 5772 strings)

Translation: Mattermost/webapp
Translate-URL: https://translate.mattermost.com/projects/mattermost/webapp/fr/

* Translated using Weblate (French)

Currently translated at 83.4% (4815 of 5772 strings)

Translation: Mattermost/webapp
Translate-URL: https://translate.mattermost.com/projects/mattermost/webapp/fr/

---------

Co-authored-by: boristrbrt <boris.trombert@gmail.com>
Co-authored-by: master7 <marcin.karkosz@rajska.info>
Co-authored-by: jprusch <rs@schaeferbarthold.de>
Co-authored-by: MArtin Johnson <martinjohnson@bahnhof.se>
Co-authored-by: kaakaa <stooner.hoe@gmail.com>
Co-authored-by: Frank Paul Silye <frankps@uio.no>
Co-authored-by: Zenocode <zenocode@protonmail.com>

server/i18n/pl.json

@@ -10038,5 +10038,9 @@
   {
     "id": "app.user.update.lastAdmin.app_error",
     "translation": "Nie możesz zdegradować ostatniego administratora systemu."
+  },
+  {
+    "id": "app.user.save.groupname.app_error",
+    "translation": "Nie można ustalić, czy ta nazwa użytkownika już istnieje"
   }
 ]