Add failureBlock in OSStateSynchronizer.updateLanguage

* Add failureBlock in OSStateSynchronizer.updateLanguage

Author: tanaynigam

iOS_SDK/OneSignalSDK/Source/OSStateSynchronizer.h

@@ -78,7 +78,7 @@ withSMSAuthHashToken:(NSString * _Nullable)hashToken
 
 - (void)updateLanguage:(NSString * _Nonnull)language
                  appId:(NSString * _Nonnull)appId
-           withSuccess:(OSUpdateLanguageSuccessBlock)successBlock
-           withFailure:(OSUpdateLanguageFailureBlock)failureBlock;
+           withSuccess:(OSUpdateLanguageSuccessBlock _Nullable)successBlock
+           withFailure:(OSUpdateLanguageFailureBlock _Nullable)failureBlock;
 
 @end

iOS_SDK/OneSignalSDK/Source/OSStateSynchronizer.m

@@ -391,7 +391,7 @@ - (void)updateLanguage:(NSString * _Nonnull)language
         requests[userStateSynchronizer.getChannelId] = [userStateSynchronizer setLanguage:language withAppId:appId];
     }
 
-    [OneSignalClient.sharedClient executeSimultaneousRequests:requests withCompletion:^(NSDictionary<NSString *,NSDictionary *> *results) {
+    [OneSignalClient.sharedClient executeSimultaneousRequests:requests withSuccess:^(NSDictionary<NSString *,NSDictionary *> *results) {
         if (results[OS_PUSH] && results[OS_PUSH][OS_SUCCESS] && [results[OS_PUSH][OS_SUCCESS] boolValue]) {
             [OneSignalUserDefaults.initStandard saveStringForKey:OSUD_LANGUAGE withValue:language];
         }
@@ -404,6 +404,11 @@ - (void)updateLanguage:(NSString * _Nonnull)language
 
         if (successBlock)
             successBlock(results);
+    } onFailure:^(NSDictionary<NSString *, NSError *> *errors) {
+        if (failureBlock) {
+            NSError *error = (NSError *)[self getFirstResultByChannelPriority:errors];
+            failureBlock(error);
+        }
     }];
 }