Update Norwegian and US English

i18n/nw_base.ts

@@ -3919,7 +3919,7 @@
     </message>
     <message>
       <location filename="../novelwriter/core/project.py" line="484" />
-      <source>Backup from {0}.zip</source>
+      <source>Backup from {0}</source>
       <translation type="unfinished" />
     </message>
     <message>

novelwriter/core/project.py

@@ -482,8 +482,8 @@ class NWProject(QObject):
             return False
 
         archName = baseDir / self.tr(
-            "Backup from {0}.zip"
-        ).format(formatTimeStamp(time(), fileSafe=True))
+            "Backup from {0}"
+        ).format(formatTimeStamp(time(), fileSafe=True) + ".zip")
         if self._storage.zipIt(archName, compression=2):
             if doNotify:
                 self.mainGui.makeAlert(self.tr(