Fix LanguageTest

* Remove runBackgroundThreads to avoid redundancy
* Fix comments

Author: tanaynigam

iOS_SDK/OneSignalSDK/UnitTests/LanguageTest.m

@@ -59,20 +59,19 @@ - (void)testSetLanguageOnPlayerCreate {
 
 - (void)testSetLanguageRequest {
     [UnitTestCommonMethods initOneSignal_andThreadWait];
-    [UnitTestCommonMethods runBackgroundThreads];
     [OneSignal setLanguage:@"fr"];
     [UnitTestCommonMethods runBackgroundThreads];
 
     XCTAssertEqualObjects(OneSignalClientOverrider.lastHTTPRequest[@"language"], @"fr");
 }
 
 -(void)testSetLanguage_afterOnSession {
-    // 2. Open app
+    // 1. Open app
     [UnitTestCommonMethods initOneSignal_andThreadWait];
     [UnitTestCommonMethods foregroundApp];
     [UnitTestCommonMethods runBackgroundThreads];
 
-    // 3. Kill the app and wait 31 seconds
+    // 2. Kill the app and wait 31 seconds
     [UnitTestCommonMethods backgroundApp];
     [UnitTestCommonMethods clearStateForAppRestart:self];
     [NSDateOverrider advanceSystemTimeBy:31];
@@ -83,6 +82,7 @@ -(void)testSetLanguage_afterOnSession {
     [UnitTestCommonMethods foregroundApp];
     [UnitTestCommonMethods runBackgroundThreads];
 
+    // 5. Set language
     [OneSignal setLanguage:@"fr"];
     [UnitTestCommonMethods runBackgroundThreads];