[NET] Reorganize and improve the help texts (1/X)

- Move common texts into separate string resources.
- Add missing help texts for ACCOUNTS, COMPUTER, CONFIG and CONTINUE commands.

base/applications/network/net/cmdLocalGroup.c

@@ -376,7 +376,10 @@ done:
         RtlFreeHeap(RtlGetProcessHeap(), 0, lpMembers);
 
     if (result != 0)
+    {
+        ConResPuts(StdOut, IDS_GENERIC_SYNTAX);
         ConResPuts(StdOut, IDS_LOCALGROUP_SYNTAX);
+    }
 
     return result;
 }