Cleanup: happily remove no-more-used PY_TRANSLATE RNA prop flag, and related code (just realized that flag value was wrong, probably own typo in a previous commit :/ ).

That "trick" was nice when introduced, but it became kind of a pita since we added translation contexts...

source/blender/python/intern/bpy_rna.c

@@ -1624,10 +1624,6 @@ static int pyrna_py_to_prop(PointerRNA *ptr, PropertyRNA *prop, void *data, PyOb
 				}
 				else {
 					/* Unicode String */
-#ifdef WITH_INTERNATIONAL
-					bool do_translate = RNA_property_flag(prop) & PROP_STRING_PY_TRANSLATE;
-#endif  /* WITH_INTERNATIONAL */
-
 #ifdef USE_STRING_COERCE
 					PyObject *value_coerce = NULL;
 					if (ELEM3(subtype, PROP_FILEPATH, PROP_DIRPATH, PROP_FILENAME)) {
@@ -1641,13 +1637,6 @@ static int pyrna_py_to_prop(PointerRNA *ptr, PropertyRNA *prop, void *data, PyOb
 					param = _PyUnicode_AsString(value);
 #endif  /* USE_STRING_COERCE */
 
-					/* Any half-brained compiler should be able to optimize this out when WITH_INTERNATIONAL is off */
-#ifdef WITH_INTERNATIONAL
-					if (do_translate) {
-						param = IFACE_(param);
-					}
-#endif
-
 					if (param == NULL) {
 						if (PyUnicode_Check(value)) {
 							/* there was an error assigning a string type,