Stage: Add missing references

Author: adazem009

src/scratch/stage.cpp

@@ -62,7 +62,7 @@ void Stage::setVideoState(VideoState newVideoState)
 }
 
 /*! \copydoc setVideoState() */
-void Stage::setVideoState(std::string newVideoState)
+void Stage::setVideoState(const std::string &newVideoState)
 {
     if (newVideoState == "on")
         setVideoState(VideoState::On);
@@ -93,7 +93,7 @@ void Stage::setVideoTransparency(int newVideoTransparency)
 }
 
 /*! Returns the text to speech language. */
-std::string Stage::textToSpeechLanguage() const
+const std::string &Stage::textToSpeechLanguage() const
 {
     return m_textToSpeechLanguage;
 }

src/scratch/stage.h

@@ -29,13 +29,13 @@ class LIBSCRATCHCPP_EXPORT Stage : public Target
         VideoState videoState() const;
         std::string videoStateStr() const;
         void setVideoState(VideoState newVideoState);
-        void setVideoState(std::string newVideoState);
+        void setVideoState(const std::string &newVideoState);
         void setVideoState(const char *newVideoState);
 
         int videoTransparency() const;
         void setVideoTransparency(int newVideoTransparency);
 
-        std::string textToSpeechLanguage() const;
+        const std::string &textToSpeechLanguage() const;
         void setTextToSpeechLanguage(const std::string &newTextToSpeechLanguage);
 
     protected: