Added option to hide warnings for fuzzy messages

The option is also hidding obsolete translations.

As proposal from https://github.com/ManageIQ/manageiq/pull/1062, we could use an option :ignore_fuzzy => true, but that one's still showing a warning message in rails log.
```
 Warning: fuzzy message was ignored.
```



@jzigmund I assume that we will add the report_warning flag after we fix up the fuzzy translations?  Also would like to know the answer to @blomquisg 's question