never throw plain char*

(now actually compiles)

src/script/functions/export.cpp

@@ -355,7 +355,7 @@ String to_bbcode(const String& str_in) {
 // convert a tagged string to BBCode
 SCRIPT_FUNCTION(to_bbcode) {
 	SCRIPT_PARAM_C(String, input);
-	throw InternalError("TODO: to_bbcode");
+	throw InternalError(_("TODO: to_bbcode"));
 //	SCRIPT_RETURN(to_bbcode(input, symbol_font));
 }