changing tab bar title dynamically

My app is in two language and having three tabs. There is a language change button inside my app, whenever changes the title of all tabs have to be changed depending on language.Here is the code I am using it works fine in iPad but the same code crashes in iPhone.Both of the device is in iOs5.

viewController1 = [[MapFirstViewController alloc] initWithNibName:@"MapFirstViewController_iPad" bundle:nil];

viewController1.tabBarItem = [[UITabBarItem alloc] initWithTitle:[self languageSelectedStringForKey:@"about"] image:[UIImage imageNamed:@"about_tabbar_icon.png"] tag:8];

viewController2 = [[MapSecondViewController alloc] initWithNibName:@"MapSecondViewController_iPad" bundle:nil];

viewController2.tabBarItem= [[UITabBarItem alloc] initWithTitle:[self languageSelectedStringForKey:@"Map"] image:[UIImage imageNamed:@"maps_tabbar_icon.png"] tag:9];

viewController3 = [[ViewListIpad alloc] initWithNibName:@"ViewListIpad" bundle:nil];

viewController3.tabBarItem= [[UITabBarItem alloc] initWithTitle:[self languageSelectedStringForKey:@"eKiosks & eSC List"] image:[UIImage imageNamed:@"esc&kiosk_tabbar_icon.png"] tag:10];

MapAppDelegate *appDelegate = (MapAppDelegate *)[[UIApplication sharedApplication] delegate];


NSMutableArray *viewControllersArray = [NSMutableArray arrayWithArray:[[appDelegate tabBarController] viewControllers]];

[viewControllersArray replaceObjectAtIndex:0 withObject:viewController1];
[viewControllersArray replaceObjectAtIndex:1 withObject:viewController2];    

[[appDelegate tabBarController] setViewControllers:viewControllersArray animated:NO];

crash log:

Thread 0 crashed with ARM Thread State:
    r0: 0x00000004    r1: 0x00000000      r2: 0x00000001      r3: 0x00000001
    r4: 0x0000000a    r5: 0x00000000      r6: 0x00000000      r7: 0x2fef4da4
    r8: 0x00235970    r9: 0x00000000     r10: 0x0010a710     r11: 0x2fef4dd4
    ip: 0x0000014e    sp: 0x2fef4d6c      lr: 0x364beff9      pc: 0x375e1628
  cpsr: 0x20000010

Binary Images:
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I think the

[[MapFirstViewController alloc] initWithNibName:@"MapFirstViewController_iPad" bundle:nil];

is your Problem. The iPhone app can not init and use *.xib for iPad!

You have to init an iPhone xib if your app is running on iPhone and an iPad xib if it is running on iPad.