More BMessageFormat rework.

I'm stopping this now, I heard we want to leave those as GCI tasks.

src/add-ons/tracker/zipomatic/ZipOMaticWindow.cpp

@@ -21,6 +21,7 @@
 #include <GroupLayout.h>
 #include <LayoutBuilder.h>
 #include <Locale.h>
+#include <MessageFormat.h>
 #include <Path.h>
 #include <Roster.h>
 #include <Screen.h>
@@ -151,17 +152,12 @@ ZippoWindow::MessageReceived(BMessage* message)
 					// being created (added to) or if we're updating an
 					// already existing archive.
 
+					static BMessageFormat format(B_TRANSLATE("{0, plural, "
+						"one{# file added.} other{# files added.}}"));
 					BString output;
-					fFileCount++;
-					BString count;
-					count << fFileCount;
+					format.Format(output, fFileCount);
 
-					if (fFileCount == 1) {
-						output << B_TRANSLATE("1 file added.");
-					} else {
-						output << B_TRANSLATE("%ld files added.");
-						output.ReplaceFirst("%ld", count.String());
-					}
+					fFileCount++;
 
 					fZipOutputView->SetText(output.String());
 				} else {

src/preferences/filetypes/ApplicationTypesWindow.cpp

@@ -21,6 +21,7 @@
 #include <Locale.h>
 #include <MenuField.h>
 #include <MenuItem.h>
+#include <MessageFormat.h>
 #include <Mime.h>
 #include <NodeInfo.h>
 #include <Path.h>
@@ -353,11 +354,12 @@ ApplicationTypesWindow::_RemoveUninstalled()
 
 	progressWindow->PostMessage(B_QUIT_REQUESTED);
 
-	char message[512];
-	// TODO: Use ICU to properly format this.
-	snprintf(message, sizeof(message),
-		B_TRANSLATE("%ld Application type%s could be removed."),
-		removed, removed == 1 ? "" : "s");
+	static BMessageFormat format(B_TRANSLATE("{0, plural, "
+		"one{# Application type could be removed} "
+		"other{# Application types could be removed}}"));
+	BString message;
+	format.Format(message, removed);
+
 	error_alert(message, B_OK, B_INFO_ALERT);
 }