* @brief check that loaded cache really is from the past
*
* Added this to avoid trouble in case the system time is changed into the past.
- * In that cast would have TTLs here in cache that are valid much too long.
+ * In that case would have TTLs here in cache that are valid much too long.
*
* Therefore check SaveCacheTime and if that is in the future, set all TTLs to 0
*