Resource bundle with Latin1 encoding causes failure

[kisg]

Resource bundles with UTF-8 encoding are working correctly (same as Android), but this deviates from the Java standard. The documentation and preferably the error message should be updated to reflect this. Also we should test whether this issue is present in OpenJDK8 based platform versions.

See also: https://discuss.multi-os-engine.org/t/exception-when-loading-message-properties/1640