Add GetClientOriginalLanguage (#1810)

Creates a native which will return the language the client connected with.

core/PlayerManager.h

@@ -96,6 +96,7 @@ public:
 	bool IsInKickQueue();
 	IPlayerInfo *GetPlayerInfo();
 	unsigned int GetLanguageId();
+	unsigned int GetOriginalLanguageId();
 	void SetLanguageId(unsigned int id);
 	int GetUserId();
 	bool RunAdminCacheChecks();
@@ -145,6 +146,7 @@ private:
 	bool m_bAdminCheckSignalled = false;
 	int m_iIndex;
 	unsigned int m_LangId = SOURCEMOD_LANGUAGE_ENGLISH;
+	unsigned int m_OriginalLangId = SOURCEMOD_LANGUAGE_ENGLISH;
 	int m_UserId = -1;
 	bool m_bFakeClient = false;
 	bool m_bIsSourceTV = false;