Fix instanciate_catalog prototype

The prototype didn't match what the Locale Kit actually uses, making the
plaintext catalog (and any other add-on) unusable.

headers/os/locale/CatalogData.h

@@ -99,8 +99,8 @@ BCatalogData::Next()
 //
 // 1. the function that instantiates a catalog for this add-on-type
 extern "C"
-BCatalogData* instantiate_catalog(const char* signature, const char* language,
-	uint32 fingerprint);
+BCatalogData* instantiate_catalog(const entry_ref& signature,
+	const char* language, uint32 fingerprint);
 
 // 2. the function that creates an empty catalog for this add-on-type
 extern "C"

headers/private/locale/PlainTextCatalog.h

@@ -18,22 +18,22 @@ namespace BPrivate {
 
 class PlainTextCatalog : public HashMapCatalog {
 	public:
-		PlainTextCatalog(const char *signature, const char *language,
+		PlainTextCatalog(const entry_ref& owner, const char *language,
 			uint32 fingerprint);
 				// constructor for normal use
-		PlainTextCatalog(entry_ref *appOrAddOnRef);
-				// constructor for embedded catalog
 		PlainTextCatalog(const char *path, const char *signature,
 			const char *language);
 				// constructor for editor-app
 
 		~PlainTextCatalog();
 
+		void SetSignature(const entry_ref &catalogOwner);
+
 		// implementation for editor-interface:
 		status_t ReadFromFile(const char *path = NULL);
 		status_t WriteToFile(const char *path = NULL);
 
-		static BCatalogData *Instantiate(const char *signature,
+		static BCatalogData *Instantiate(const entry_ref &signature,
 			const char *language, uint32 fingerprint);
 
 		static const char *kCatMimeType;