correct maltese language key (#5702)

Author: charlotteliang

FirebaseMessaging/CHANGELOG.md

@@ -1,5 +1,6 @@
 # unreleased
 - [changed] Use UNNotificationRequest to schedule local notification for local timezone notification for iOS 10 and above. This should also fix the issue that '%' was not properly shown in title and body. (#5667)
+- [fixed] Fixed Maltese language key for language targeting. (#5702)
 
 # 2020-05 -- v4.4.1
 - [changed] Updated NSError with a failure reason to give more details on the error. (#5511)

FirebaseMessaging/Sources/FIRMessaging.m

@@ -1070,7 +1070,7 @@ + (NSDictionary *)firebaselocalesMap {
     // Malay
     @"ms" : @[ @"ms_MY" ],
     // Maltese
-    @"ms" : @[ @"mt_MT" ],
+    @"mt" : @[ @"mt_MT" ],
     // Polish
     @"pl" : @[ @"pl", @"pl_PL", @"pl-PL" ],
     // Romanian

FirebaseMessaging/Sources/NSError+FIRMessaging.h

@@ -16,8 +16,6 @@
 
 #import <Foundation/Foundation.h>
 
-#import <FirebaseMessaging/FIRMessaging.h>
-
 NS_ASSUME_NONNULL_BEGIN
 
 FOUNDATION_EXPORT NSString *const kFIRMessagingDomain;