Fix translations of log-in page and sync message

The French and Italian translations didn't have proper newlines there.
The message for the sync progress wasn't translated because it didn't properly get the catalog.

Contributes to issue CURA-8472.

plugins/Toolbox/src/CloudSync/DownloadPresenter.py

@@ -6,7 +6,7 @@
 
 from PyQt5.QtNetwork import QNetworkReply
 
-from UM import i18n_catalog
+from UM.i18n import i18nCatalog
 from UM.Logger import Logger
 from UM.Message import Message
 from UM.Signal import Signal
@@ -15,6 +15,8 @@
 from cura.UltimakerCloud.UltimakerCloudScope import UltimakerCloudScope
 from .SubscribedPackagesModel import SubscribedPackagesModel
 
+i18n_catalog = i18nCatalog("cura")
+
 
 class DownloadPresenter:
     """Downloads a set of packages from the Ultimaker Cloud Marketplace
@@ -90,7 +92,7 @@ def _createProgressMessage(self) -> Message:
             lifetime = 0,
             use_inactivity_timer = False,
             progress = 0.0,
-            title = i18n_catalog.i18nc("@info:title", "Changes detected from your Ultimaker account", ))
+            title = i18n_catalog.i18nc("@info:title", "Changes detected from your Ultimaker account"))
 
     def _onFinished(self, package_id: str, reply: QNetworkReply) -> None:
         self._progress[package_id]["received"] = self._progress[package_id]["total"]

resources/i18n/fr_FR/cura.po

@@ -3127,7 +3127,10 @@ msgid ""
 "- Add material profiles and plug-ins from the Marketplace\n"
 "- Back-up and sync your material profiles and plug-ins\n"
 "- Share ideas and get help from 48,000+ users in the Ultimaker community"
-msgstr "- Ajoutez des profils de matériaux et des plug-ins à partir de la Marketplace - Sauvegardez et synchronisez vos profils de matériaux et vos plug-ins - Partagez vos idées et obtenez l'aide de plus de 48 000 utilisateurs de la communauté Ultimaker"
+msgstr ""
+"- Ajoutez des profils de matériaux et des plug-ins à partir de la Marketplace\n"
+"- Sauvegardez et synchronisez vos profils de matériaux et vos plug-ins\n"
+"- Partagez vos idées et obtenez l'aide de plus de 48 000 utilisateurs de la communauté Ultimaker"
 
 #: /home/trin/Gedeeld/Projects/Cura/resources/qml/Account/GeneralOperations.qml:62
 msgctxt "@button"

resources/i18n/it_IT/cura.po

@@ -3130,7 +3130,8 @@ msgid ""
 "- Share ideas and get help from 48,000+ users in the Ultimaker community"
 msgstr ""
 "- Aggiungi profili materiale e plugin dal Marketplace\n"
-"- Esegui il backup e la sincronizzazione dei profili materiale e dei plugin⏎- Condividi idee e ottieni supporto da più di 48.000 utenti nella community di Ultimaker"
+"- Esegui il backup e la sincronizzazione dei profili materiale e dei plugin\n"
+"- Condividi idee e ottieni supporto da più di 48.000 utenti nella community di Ultimaker"
 
 #: /home/trin/Gedeeld/Projects/Cura/resources/qml/Account/GeneralOperations.qml:62
 msgctxt "@button"