Make Translation APIs coverred. We use a custom TranslationService in the cts test, we override onConnected() and onDisconnected() but we don't call super that makes TranslationService methods are not being called. Call super in onConnected() and onDisconnected() to fix the issue. Bug: 183239233 Test: atest CtsTranslationTestCases Change-Id: I01efe009863c9622608898cf76f4726c4b5161da